Havana, Cuba (CNN) Fidel Castro's funeral will bring together an unlikely mix of world leaders, royalty, Marxist guerillas and Hollywood actors.

So, who's coming?

The official guest list goes on for 20 pages, with a varied group of VIPs such as former Spanish King Juan Carlos I, a vice president of the North Korean worker's party and left-leaning actor Danny Glover.

Castro's wife and children, whose existence for years was a state secret, could make a rare appearance. Castro's long-estranged sister Juanita Castro said she would not be leaving exile in Miami to attend the funeral.

Nearly every Latin American head of state will be on hand, though.

The arrival of left-leaning presidents of Bolivia, Ecuador, Nicaragua and Venezuela is no surprise and in fact speaks to how much the world has changed since Fidel Castro took power in 1959.

Shortly after the Cuban revolution, every country in the Western Hemisphere except Mexico broke relations with Cuba, alarmed at Castro's growing alliance with the Soviet Union.

But thanks to a recent boom in leftist governments -- some Castro helped to install, like that of Nicaragua's Daniel Ortega -- the region is now chock-full of Cuba allies.

Photos: Cuba remembers Castro Workers place a plaque with the word "Fidel" on the tomb holding the remains of former Cuban President Fidel Castro in the Cementerio Santa Ifigenia where he was buried, Sunday, December 4, in Santiago de Cuba. Cubans are honoring his life this week. Hide Caption 1 of 38 Photos: Cuba remembers Castro A Cuban government supporter cries during Castro's funeral on December 4. Hide Caption 2 of 38 Photos: Cuba remembers Castro Fidel Castro's funeral in Santiago de Cuba on December 4. Hide Caption 3 of 38 Photos: Cuba remembers Castro Fidel Castro's ashes pass on the streets going to the cemetery in Santiago de Cuba on December 4. Hide Caption 4 of 38 Photos: Cuba remembers Castro Cuban government supporters chant for Fidel Castro near the entrance of the cemetery on December 4. Hide Caption 5 of 38 Photos: Cuba remembers Castro Cuban government supporters chant for Fidel Castro near the entrance of the cemetery on December 4. Hide Caption 6 of 38 Photos: Cuba remembers Castro The ashes of the former Cuban leader pass below an iconic revolutionary banner as the cortège makes the final movement to the cemetery on December 4. Hide Caption 7 of 38 Photos: Cuba remembers Castro Cubans await for the passage of the urn containing the ashes of Fidel Castro on December 4. Hide Caption 8 of 38 Photos: Cuba remembers Castro Cubans await the passage of Castro's ashes from Revolution Square in Santiago, Cuba on December 4. Hide Caption 9 of 38 Photos: Cuba remembers Castro Cubans wait on the side of the road for the caravan carrying the ashes on December 3. Hide Caption 10 of 38 Photos: Cuba remembers Castro A man on horseback Saturday, December 3, waits on the side of the road for the caravan carrying the ashes of former Cuban President Fidel Castro, who died at age 90 on November 25. Hide Caption 11 of 38 Photos: Cuba remembers Castro Cubans see the ashes of Fidel Castro being carried by a special convoy through the city of Holguin on Saturday, December 3. Hide Caption 12 of 38 Photos: Cuba remembers Castro A soldier reacts after the ashes of longtime Cuban leader Fidel Castro passed through Santa Clara, Cuba, on Thursday, December 1. Hide Caption 13 of 38 Photos: Cuba remembers Castro People watch from a rooftop as Castro's remains pass by in Santa Clara on December 1. Castro's ashes are on a four-day journey from Havana to Santiago de Cuba. Hide Caption 14 of 38 Photos: Cuba remembers Castro The trailer of a military jeep carries the flag-draped coffin containing Castro's ashes. Hide Caption 15 of 38 Photos: Cuba remembers Castro A car adorned with messages to Castro sits parked on a street in La Esperanza, Cuba, on Wednesday, November 30. Hide Caption 16 of 38 Photos: Cuba remembers Castro Castro's ashes are driven through Revolution Square in Havana on November 30. Hide Caption 17 of 38 Photos: Cuba remembers Castro People line up to pay their final respects at a Castro memorial in Santa Clara on November 30. The theater marquee reads "Thank you Fidel" in Spanish. Hide Caption 18 of 38 Photos: Cuba remembers Castro Schoolchildren react as a helicopter passes overhead in Cardenas, Cuba, on November 30. Hide Caption 19 of 38 Photos: Cuba remembers Castro Women comfort one another after watching Castro's remains pass by in Havana on November 30. Hide Caption 20 of 38 Photos: Cuba remembers Castro Ministry of Interior troops hold a Cuban flag as they wait for the military caravan transporting Castro's remains on November 30. Hide Caption 21 of 38 Photos: Cuba remembers Castro A girl in Havana holds a sign that reads "I am Cuba. I am Fidel. I am revolution" on Tuesday, November 29. Hide Caption 22 of 38 Photos: Cuba remembers Castro People in Havana participate in a massive rally at Revolution Square on November 29. Hide Caption 23 of 38 Photos: Cuba remembers Castro Cuban President Raul Castro, left, Nicaraguan President Daniel Ortega, center, and Ecuadorian President Rafael Correa, far right, take part in the Revolution Square rally on November 29. Hide Caption 24 of 38 Photos: Cuba remembers Castro Navy cadets join the crowd during the rally on November 29. Hide Caption 25 of 38 Photos: Cuba remembers Castro Laurenso, an 80-year-old army veteran, pays his respects in Revolution Square on November 29. Hide Caption 26 of 38 Photos: Cuba remembers Castro A woman stretches her hand toward a picture of Castro at a memorial in Guanabacoa, on the outskirts of Havana, on November 29. Hide Caption 27 of 38 Photos: Cuba remembers Castro An honor guard fires a 21-gun salute to mark the start of services paying tribute to Castro in Havana on Monday, November 28. Hide Caption 28 of 38 Photos: Cuba remembers Castro People gather at Revolution Square to pay tribute to Castro on Monday, November 28. Hide Caption 29 of 38 Photos: Cuba remembers Castro A man in Havana pays tribute to Castro on November 28. Hide Caption 30 of 38 Photos: Cuba remembers Castro Thousands wait in line at Revolution Square on November 28. Hide Caption 31 of 38 Photos: Cuba remembers Castro Cubans hold photos of Castro as they wait to pay their respects at Revolution Square on November 28. Hide Caption 32 of 38 Photos: Cuba remembers Castro People pay their last respects to Castro in Revolution Square. Hide Caption 33 of 38 Photos: Cuba remembers Castro Cuban soldiers march near Revolution Square on November 28. Hide Caption 34 of 38 Photos: Cuba remembers Castro A woman dries her tears as she waits to pay her respects in Havana on November 28. Hide Caption 35 of 38 Photos: Cuba remembers Castro Alejandro Castro Espin, son of Cuban President Raul Castro, offers his condolences to his cousin Antonio Castro Soto del Valle, right, at Revolution Square. Hide Caption 36 of 38 Photos: Cuba remembers Castro Students sign a book of condolences and a loyalty oath for Fidel Castro at a community center in Havana on November 28. Hide Caption 37 of 38 Photos: Cuba remembers Castro Workers hang a giant banner of a young Castro from the Cuban National Library in Havana on Sunday, November 27. Hide Caption 38 of 38

Many observers will be watching for the interaction between Venezuelan President Nicolas Maduro and Raul Castro. Since late Venezuelan President Hugo Chavez began to copy Cuba's socialist and fiercely anti-US government style, Cuba and Venezuela have all but melded into one country.

But with oil prices plummeting, Venezuela has been forced to cut precious oil subsidies to Cuba, leading many to wonder if the Venezuela-Cuba love affair is on the rocks.

Both Colombian government officials and their longtime adversaries the FARC guerrillas are attending. That speaks volumes about how Cuba has changed its role in world affairs.

For decades, Cuba supported the Marxist guerrillas in their attempt to topple Colombia's government, earning the island until 2015 a spot on the US State Department's list of countries that support terrorism.

But for the last four years Cuba hosted Colombian peace talks that in November led to a deal between Colombia's government and guerrillas , a big turnaround from the early years, when an isolated Fidel Castro tried to spread his revolution to other countries at the point of a gun.

For decades Cuba was a beacon for would-be revolutionaries and even provided military training to dozens of radical groups, who are sending representatives to pay their respects to the fallen Castro.

CNN's Nic Robertson caught up with Gerry Adams, the former leader of Sinn Fein, the political wing of the IRA, as he stood in the massive line of people in Havana's Revolution Square

"I'm here because Fidel was a good friend to Ireland," Adams said.

Castro was also "a good friend" to revolutions across Africa. On Tuesday, Zimbabwe's ailing President Robert Mugabe arrived to attend the memorial to Castro.

"Fidel wasn't just your leader, Fidel was the leader of all revolutionaries," Mugabe told Cuban state TV upon arriving at Havana's Jose Martí Airport.

But leaders of the United States and Russia, the two countries that most defined Cuba's international relations, will be conspicuously absent during the memorials.

Despite having made history by restoring diplomatic relations with Cuba and carrying out the first visit to Cuba since the revolution by a US president, Barack Obama will skip Castro's funeral.

Obama did not meet with Castro during his landmark trip and the former Cuban leader later attacked him for his Cuba policy.

The US Embassy in Havana is one of the few diplomatic missions in the Cuban capital that has not lowered its flag to half-staff to mark Castro's death.

Photos: Former Cuban leader Fidel Castro dies Fidel Castro exhales cigar smoke during a March 1985 interview at his presidential palace in Havana, Cuba. Castro died at age 90 on November 25, 2016, Cuban state media reported. Click through to see more photos from the life of the controversial Cuban leader who ruled for nearly half a century: Hide Caption 1 of 37 Photos: Former Cuban leader Fidel Castro dies A portrait of Castro in New York in 1955. He was in exile after being released as part of a general amnesty for political prisoners in Cuba. Two years earlier, he and about 150 others staged an unsuccessful attempt to overthrow the regime of Fulgencio Batista. Hide Caption 2 of 37 Photos: Former Cuban leader Fidel Castro dies Castro with Argentine revolutionary Che Guevara during the early days of their guerrilla campaign in Cuba's Sierra Maestra mountains. Guevara, Castro and Castro's brother Raul organized a group of Cuban exiles that returned to Cuba in December 1956 and waged a guerrilla war against government troops. Hide Caption 3 of 37 Photos: Former Cuban leader Fidel Castro dies Castro and his revolutionaries hold up their rifles in January 1959 after overthrowing Batista. Hide Caption 4 of 37 Photos: Former Cuban leader Fidel Castro dies Crowds cheer Castro on his victorious march into Havana in 1959. Hide Caption 5 of 37 Photos: Former Cuban leader Fidel Castro dies Surrounded by rebels who came with him from the mountains, Castro gives an all-night speech. Hide Caption 6 of 37 Photos: Former Cuban leader Fidel Castro dies Castro, left, became Cuba's prime minister in February 1959. His brother Raul, right, was commander in chief of the armed forces. Hide Caption 7 of 37 Photos: Former Cuban leader Fidel Castro dies During a visit to New York in 1959, Fidel Castro spends time with a group of children. Hide Caption 8 of 37 Photos: Former Cuban leader Fidel Castro dies American talk-show host Ed Sullivan interviews Castro on a taped segment in 1959. Hide Caption 9 of 37 Photos: Former Cuban leader Fidel Castro dies Castro shakes hands with US Vice President Richard Nixon during a reception in Washington in 1959. Hide Caption 10 of 37 Photos: Former Cuban leader Fidel Castro dies Castro addresses the UN General Assembly in September 1960. Hide Caption 11 of 37 Photos: Former Cuban leader Fidel Castro dies Castro jumps from a tank in April 1961 as he arrives at Giron, Cuba, near the Bay of Pigs. That month, a group of about 1,300 Cuban exiles, armed with US weapons, made an unsuccessful attempt to overthrow Castro. Hide Caption 12 of 37 Photos: Former Cuban leader Fidel Castro dies Castro announces general mobilization after the announcement of the Cuban blockade by President John F Kennedy in October 1962. Hide Caption 13 of 37 Photos: Former Cuban leader Fidel Castro dies Castro raises arms with Soviet leader Nikita Khrushchev during a four-week visit to Moscow in May 1963. Hide Caption 14 of 37 Photos: Former Cuban leader Fidel Castro dies Castro in July 1964. Hide Caption 15 of 37 Photos: Former Cuban leader Fidel Castro dies Castro plays baseball in 1964. Hide Caption 16 of 37 Photos: Former Cuban leader Fidel Castro dies Castro addresses thousands of Cubans in Havana in 1968. Hide Caption 17 of 37 Photos: Former Cuban leader Fidel Castro dies In 1977, Castro uses a map as he describes the 1961 Bay of Pigs invasion to ABC correspondent Barbara Walters. Hide Caption 18 of 37 Photos: Former Cuban leader Fidel Castro dies Iraq's Saddam Hussein, center, with the Castro brothers during a visit to Cuba in January 1979. Hide Caption 19 of 37 Photos: Former Cuban leader Fidel Castro dies Castro greets Soviet leader Mikhail Gorbachev in Havana in April 1989. Hide Caption 20 of 37 Photos: Former Cuban leader Fidel Castro dies Castro visits Paris in March 1995. Hide Caption 21 of 37 Photos: Former Cuban leader Fidel Castro dies Castro meets with Pope John Paul II on an airport tarmac in Havana in January 1998. It was the first papal visit to Cuba. Hide Caption 22 of 37 Photos: Former Cuban leader Fidel Castro dies Castro puts his arm around South African President Nelson Mandela in May 1998 with Italian Prime Minister Romano Prodi, left, and Brazilian President Fernando Henrique Cardoso. They were in Geneva, Switzerland, for a conference of the World Trade Organization. Hide Caption 23 of 37 Photos: Former Cuban leader Fidel Castro dies Castro welcomes Russian President Vladimir Putin to Cuba in December 2000. Putin was the first Russian President to visit Cuba since the fall of the Berlin Wall. Hide Caption 24 of 37 Photos: Former Cuban leader Fidel Castro dies Castro is helped by aides after he appeared to faint while giving a speech in Cotorro, Cuba, in June 2001. He returned to the podium less than 10 minutes later to assure the audience he was fine and that he just needed to get some sleep. Hide Caption 25 of 37 Photos: Former Cuban leader Fidel Castro dies In July 2001, Castro talks with Elian Gonzalez, the young boy who was the focus of a bitter international custody dispute a couple of years earlier. Hide Caption 26 of 37 Photos: Former Cuban leader Fidel Castro dies Castro and former US President Jimmy Carter listen to the US national anthem after Carter arrived in Havana for a visit in May 2002. Hide Caption 27 of 37 Photos: Former Cuban leader Fidel Castro dies Castro at the May Day commemoration of Revolution Square in Havana in 2004. He held tightly to his belief in a socialist economic model and one-party Communist rule, even after the Soviet Union's end and most of the rest of the world concluded state socialism was an idea whose time had passed. Hide Caption 28 of 37 Photos: Former Cuban leader Fidel Castro dies Castro, left, and his brother Raul attend a session of the Cuban parliament in July 2004. Hide Caption 29 of 37 Photos: Former Cuban leader Fidel Castro dies Castro speaks in Havana in February 2006. Hide Caption 30 of 37 Photos: Former Cuban leader Fidel Castro dies Castro in Havana in September 2002. Several surgeries forced him to relinquish his duties temporarily to younger brother Raul in July 2006. Hide Caption 31 of 37 Photos: Former Cuban leader Fidel Castro dies In footage from state-owned Cuban television, Venezuelan President Hugo Chavez visits an ailing Castro in September 2006. That July, it was announced that Castro was undergoing intestinal surgery. Castro resigned as President in February 2008, and his brother Raul took over permanently. Hide Caption 32 of 37 Photos: Former Cuban leader Fidel Castro dies Castro smiles before delivering a speech in Havana in September 2010. He had remained mostly out of sight after falling ill in 2006 but returned to the public light that year. Hide Caption 33 of 37 Photos: Former Cuban leader Fidel Castro dies Pope Benedict XVI meets with Castro in Havana in March 2012. Hide Caption 34 of 37 Photos: Former Cuban leader Fidel Castro dies In this picture provided by CubaDebate, Castro talks to Randy Perdomo, president of Cuba's University Students Federation, during a February meeting in Havana. Hide Caption 35 of 37 Photos: Former Cuban leader Fidel Castro dies Castro visits with 19 cheese masters on Friday, July 3, 2015, in a rare trip outside his Havana home. Hide Caption 36 of 37 Photos: Former Cuban leader Fidel Castro dies Leader of the Russian Orthodox Church, Patriarch Kirill, left, visits with Fidel Castro during a meeting at Castro's home on February 14, 2016. Hide Caption 37 of 37

"If Cuba is unwilling to make a better deal for the Cuban people, the Cuban/American people and the US as a whole, I will terminate deal," Trump tweeted on Sunday.

While Russia is sending a delegation to Cuba, Vladimir Putin, who met with Castro during his last visit to Cuba in 2015 and promised closer relations with the former USSR's close ally, is not scheduled to travel to the island.

There has been no explanation for Putin's absence, but it may well be that the Russian President is prioritizing the possibility of better relations with the incoming Trump administration over Russia's past ties with an old comrade.