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A U.S. guided-missile submarine arrived in South Korea on Tuesday and envoys from the U.S., Japan and South Korea met in Tokyo, as North Korea marked the anniversary of the founding of its military.

Though experts thought a nuclear test or ballistic missile launch was possible around the anniversary, the morning came and went without either. South Korea's Yonhap news agency, citing a South Korean government source, reported that North Korea instead appeared to have held a major live-fire drill in the Wonsan city area.

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NORTH KOREAN GENERAL WARNS OF PRE-EMPTIVE STRIKE

Crowds in Pyongyang, the North Korean capital, laid flowers and paid respects at giant statues of the country's former leaders Kim Il Sung and Kim Jong Il, one day after the minister of defense reiterated that North is ready to use pre-emptive strikes or any other measures it deems necessary to defend itself against the "U.S. imperialists."

"The situation prevailing on the Korean peninsula is so tense that a nuclear war may break out due to the frantic war drills of the U.S. imperialists and their vassal forces for aggression," Gen. Pak Yong Sik said at a "national meeting" of thousands of senior military and civilian officials.

South Korea's military said it's closely watching North Korean troop movement around Wonsan, but didn't confirm the Yonhap report, which cited an unnamed source to report that the North carried out an exercise involving 300 to 400 artillery pieces.

The streets of Pyongyang were quiet. Flower-laying and bowing at statues and portraits of the leaders is a regular routine on major anniversaries. Groups of people also gathered in open spaces around the city to take part in organized dancing sessions, another common way of marking holidays in North Korea.

"Our great leaders founded and wisely led our revolutionary army, and just like that, now our respected Marshal Kim Jong Un is leading wisely, so even though the situation is tense, we are celebrating the day," said Choe Un Byol, who had come with his family to the bronze statues of the former leaders.

North Korea often marks significant dates by displaying its military capability and has conducted five nuclear tests. Pyongyang launched a missile one day after the 105th birthday of late founder Kim Il Sung on April 15.

Recent U.S. commercial satellite images indicate increased activity around North Korea's nuclear test site, and third-generation dictator Kim Jong Un has said the country's preparation for an ICBM launch is in its "final stage."

South Korea's Defense Ministry has said North Korea appears ready to conduct such "strategic provocations" at any time. South Korean Prime Minister Hwang Kyo-ahn, the country's acting leader, has instructed his military to strengthen its "immediate response posture" in case North Korea does something significant on Tuesday's anniversary.

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U.S. NAVY GATHERS OFF KOREAS

The nuclear-powered USS Michigan submarine arrived at Busan in what was described as a routine port visit to rest the crew and load supplies. Cmdr. Jang Wook from the South Korean navy public affairs office said there is no plan for any drill.

The submarine's arrival comes as the USS Carl Vinson aircraft carrier heads toward the Korean Peninsula for a joint exercise with South Korea around the weekend.

Despite the buildup, President Donald Trump has reportedly settled on a strategy that emphasizes increased pressure on North Korea with the help of China, the North's only major ally, instead of military options or trying to overthrow North Korea's government.

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WASHINGTON'S WORDS

Trump has told ambassadors from U.N. Security Council member countries that they must be prepared to impose additional and stronger sanctions on North Korea.

"This is a real threat to the world, whether we want to talk about it or not," Trump said at a White House meeting Monday. "North Korea is a big world problem, and it's a problem we have to finally solve. People have put blindfolds on for decades, and now it's time to solve the problem."

Nikki Haley, Trump's U.N. ambassador, said the U.S. isn't looking for a fight with Kim and wouldn't attack North Korea "unless he gives us reason to do something." She praised China's increased pressure on North Korea.

Asked about the threshold for U.S. action, Haley told American broadcaster NBC that "if you see him attack a military base, if you see some sort of intercontinental ballistic missile, then obviously we're going to do that."

But asked what if North Korea tests an intercontinental missile or nuclear device, she said: "I think then the president steps in and decides what's going to happen."

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DIPLOMATS MEET IN TOKYO

U.S. representative for North Korea Policy Joseph Yun met Tuesday with his Japanese counterpart Kenji Kanasugi and Kim Hong-kyun of South Korea. Japan's Chief Cabinet Secretary Yoshihide Suga told reporters that the three envoys were to deepen cooperation and ensure their countries stay on the same page amid growing tension.

Japan's Foreign Ministry also announced that China's envoy for North Korea, Wu Dawei, is arriving in Tokyo on Tuesday for talks with Kanasugi, which may take place later this week.

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Kim reported from Seoul, South Korea. Associated Press writers Mari Yamaguchi and Ken Moritsugu in Tokyo and Matthew Pennington in Washington contributed to this report.