"[China and Russia] back Maduro to the hilt because they have much to lose if his leftist government falls. Both maintain crucial military facilities in the country... In recent months, China, the regime's largest creditor, has been digging itself in deeper. In September, Beijing extended Venezuela another $5 billion in credit. Russia has also loaned the country billions." — Gordon G. Chang, Gatestone Institute.

It is urgent for Washington to act before Russia and Venezuela reach their imminent formal military agreement. At the same time, NATO membership should be offered to Brazil, a major ally, and economic aid should be provided to Columbia.

Russia was considering deploying strategic bombers full-time in Venezuela, according to the Russian newspaper Nezavisimaya Gazeta , as reported by Moscow Times . The Russian media outlet also reported that an agreement had been reached between Moscow and Caracas to allow the deployment of Russian aircraft at a military base Venezuela's Caribbean island of La Orchila, where Russian advisers were dispatched in December.

Pictured: Venezuelan and Russian military personnel at a ceremony for the arrival of two Russian Air Force Tu-160 strategic bombers in Venezuela, on December 10, 2018. (Image source: RT video screenshot)

After the landing of two Russian aircraft in Caracas on March 23 -- one an Ilyushin Il-62 passenger plane transporting 100 ground forces and the other an Antonov An-124 military cargo plane carrying 35 tons of materiel – U.S. President Donald J. Trump said that "Russia has to get out" of Venezuela.

In January, two months before this arrival of Russian military personnel and equipment in Venezuela, two Russian Air Force Tu-160 strategic bombers flying over the Arctic region near the North American coastline were detected and escorted out of the area by Canadian and U.S. Air Force jets.

Although it was not clear where these Russian bombers were headed, a similar incident had occurred a few weeks before, when two of the same type of Russian Tu-160 strategic bombers landed outside Caracas -- sorties indicating that these, too, were headed to Venezuela.

According to the Moscow Times, the Russian newspaper Nezavisimaya Gazeta reported earlier in December that Russia was considering deploying strategic bombers full-time in Venezuela. The Russian media outlet also reported that an agreement had been reached between Moscow and Caracas to allow the deployment of Russian aircraft at a military base on Venezuela's Caribbean island of La Orchila, where Russian advisers were dispatched in December.

The above moves are all part of Russia's open support for the beleaguered government of Venezuelan President Nicolás Maduro, which the U.S. and dozens of other nations have declared illegitimate. These countries support the popular young chairman of Venezuela's National Assembly, opposition leader Juan Guaidó, who has claimed an interim presidency.

Most 21st century Russian invasions have been launched in order to bring about or prevent regime change. Putin invaded Georgia in 2008 to undermine President Mikheil Saakashvili, who had pushed aggressively for Georgia's entry into NATO and the EU.

Putin's 2014 invasions in Crimea and eastern Ukraine were a response to what viewed as an illegal and unconstitutional coup in Kiev, which removed Ukraine from the Kremlin's orbit. While intervening in the Syrian civil war, which began in 2011, ostensibly to save Syrian President Bashar Assad's rule, Putin also aimed at projecting Russian power into the eastern Mediterranean.

By late 2018, Putin had achieved both goals. Meanwhile, Trump -- heir to a covert war started by his predecessor, President Barack Obama -- decided to withdraw U.S. forces from Syria.

Putin's response was to defrost the conflict with Ukraine in the Azov Sea. Instead of attacking the port city of Mariupol, however -- as some had expected -- he turned his attention to the more timely crisis in Venezuela.

As it did for Syria's Assad, Russia has been providing the Maduro regime with economic and military aid. While Syria is an important energy-transfer state, Venezuela is an energy jewel: in fact, it harbors one of the world's largest oil reserves. Maduro's Venezuela is also part of what U.S. National Security Adviser John R. Bolton has termed the "troika of tyranny," the others being Cuba and Nicaragua.

The recent landing of the two Russian planes in Venezuela came a mere a few days after the Trump administration's special envoy to Venezuela, Elliott Abrams, met with Russian Deputy Foreign Minister Sergei Ryakbov in Rome. At that meeting, the two negotiators agreed to disagree over who was the real leader of Venezuela, Maduro or Guaidó. Ryakbov failed to mention, however, that Russia was about to dispatch military aircraft and manpower to Caracas.

Although this and other recent Russian moves in Venezuela are relatively minor at the moment, Moscow's intervention, if kept unchecked, obviously will grow as it did in Syria.

The same also applies to moves by Beijing. As Gordon G. Chang recently wrote:

"[China and Russia] back Maduro to the hilt because they have much to lose if his leftist government falls. Both maintain crucial military facilities in the country... In recent months, China, the regime's largest creditor, has been digging itself in deeper. In September, Beijing extended Venezuela another $5 billion in credit. Russia has also loaned the country billions."

Meanwhile, two Leninist-turned-narcotics traffickers – the Revolutionary Armed Forces of Colombia (FARC), and the National Liberation Army (ELN) -- have been coordinating their activities with the Maduro regime, which is also backed by Iran.

It is therefore not sufficient for Trump to tell Russia to leave Venezuela. It is imperative for the U.S. to liberate the people of Venezuela -- in the throes of a major humanitarian catastrophe -- from Maduro's stranglehold. It is urgent for Washington to act before Russia and Venezuela reach their imminent formal military agreement.

President Trump should declare that no additional Russian and Chinese military planes and ships will be allowed to enter Venezuela, and, if legally possible, back up this announcement with an air and sea blockade. At the same time, NATO membership should be offered to Brazil, a major ally, and economic aid should be provided to Colombia.

Only a speedy, tough response can salvage what is left of the Monroe Doctrine, the basic premise of which is to keep extra-hemispheric hostile forces out of the U.S.'s strategic backyard.

A few weeks ago, when Maduro denied food and medical assistance to his starving people, the U.S. had a compelling enough reason, political considerations permitting, to invade Venezuela, even before the Russians got militarily involved. Delay, as Moscow's move constitutes a dangerous encroachment on U.S. national security, has made things both more complicated and more necessary.

While the Trump administration contemplates how to proceed further to prevent Venezuela from falling to Russia, it might recall the words of the late American diplomat George Kennan, best known for advocating the policy of "containment" to oppose Soviet expansionism after World War II.

Kennan, in a 1950 memorandum , summed up his view of how the U.S. should approach and keep Latin America from falling to the Soviets.

He wrote to the countries south of the border an "imaginary statement" that read, in part:

"We hold out to you what perhaps no great power—no power of our relative importance in world affairs — has ever held out to neighboring smaller powers: the most scrupulous respect for your sovereignty and independence, the willing renunciation of the use of force in our relations with you, the readiness to join with you at any time in a large variety of forms of collaboration which can be of benefit to us both. But you will appreciate that the payoff for this unprecedentedly favorable and tolerant attitude is that you do not make your countries the sources or the seats of dangerous intrigue against us..."

Dr. Jiri Valenta is a member of the U.S. Council on Foreign Relations in New York, and formerly served at the Brookings Institution and the Wilson Center for International Scholars in Washington, D.C. A former tenured associate professor at the U.S. Naval Postgraduate School, he is presently a senior research associate at the Begin-Sadat Center for Strategic Studies at Bar-Ilan University in Israel. The author of Soviet Intervention in Czechoslovakia, 1968, and other books, his publications include the BESA monograph, "Washington and Moscow: Conflict or Cooperation?"