A photo showing U.S. President Donald Trump and North Korean leader Kim Jong Un is displayed as a member of People's Democratic Party stands to oppose military exercises between the United States and South Korea near the U.S. embassy in Seoul, South Korea, Tuesday, June 19, 2018. The Pentagon on Monday, June 18, 2018, formally suspended a major military exercise planned for August with South Korea, a much-anticipated move stemming from Trump's nuclear summit with Kim. The signs read: " Stop Ulchi Freedom Guardian (UFG) exercises and withdrawal of U.S. troops." (AP Photo/Ahn Young-joon)

A photo showing U.S. President Donald Trump and North Korean leader Kim Jong Un is displayed as a member of People's Democratic Party stands to oppose military exercises between the United States and South Korea near the U.S. embassy in Seoul, South Korea, Tuesday, June 19, 2018. The Pentagon on Monday, June 18, 2018, formally suspended a major military exercise planned for August with South Korea, a much-anticipated move stemming from Trump's nuclear summit with Kim. The signs read: " Stop Ulchi Freedom Guardian (UFG) exercises and withdrawal of U.S. troops." (AP Photo/Ahn Young-joon)

SEOUL, South Korea (AP) — South Korea on Tuesday presented a united front with the U.S. on a decision to call off major joint military drills, one week after President Donald Trump’s surprise announcement that he would suspend such exercises with the longtime Asian ally.

Shortly after the U.S. and South Korean militaries formally announced the Ulchi Freedom Guardian exercises slated for August had been called off, Seoul’s Defense Ministry said the decision was necessary to support ongoing talks both countries have with North Korea.

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“South Korea and the U.S. made the decision as we believe this will contribute to maintaining such momentum,” said Choi Hyun-soo, the ministry’s spokeswoman.

The announcement was widely anticipated following Trump’s meeting with North Korean leader Kim Jong Un last week. Trump said after the summit in Singapore that he would suspend the U.S. military’s “war games” with South Korea unless and until the talks on ending North Korea’s nuclear weapons program break down.

His statement appeared to catch both South Korea and the Pentagon by surprise, but they presented a united front in canceling the upcoming exercises.

Dana White, spokeswoman for the U.S. Defense Department, said planning for the summer drills had stopped, but no decisions have been made on any other military exercises with South Korea. Joint exercises with Japan and other countries in the Pacific will continue.

Choi echoed that nothing has been decided on other exercises. She was unwilling to provide a straightforward answer when asked whether there had been any discussions between the allies’ militaries on suspending the drills before Trump’s sudden announcement.

“We consider the ongoing denuclearization negotiations with North Korea as crucial, so as long as those negotiations continue, the decision by the governments of South Korea and the United States will be maintained,” she said.

Japanese Defense Minister Itsunori Onodera showed understanding for the move but stressed the need for the two countries to continue their other joint drills.

He called U.S.-South Korean exercises “important pillars” for maintaining regional peace and stability. Plans for U.S.-Japan exercises are unchanged, he added.

In Beijing, foreign ministry spokesman Geng Shuang said the suspension of U.S.-South Korean drills was a “positive and constructive move.” During the tensions created by North Korean weapons tests in recent years, China had called for a “dual suspension” in which the North would stop its nuclear and missile tests and Washington and Seoul would halt their military exercises to lower animosity and lead to talks.

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“We support this, we hope the relevant parties will move in the same direction to make greater efforts to promote the peace and denuclearization process for the peninsula,” Geng said at a regular briefing.

Last year’s Ulchi Freedom Guardian went on for 11 days in August and involved about 17,500 U.S. and 50,000 South Korean troops. Also participating were other nations that contributed forces during the 1950-53 Korean War, including Australia, Britain, Canada and Colombia.

The summertime military exercises usually coincide with a nationwide civilian defense drill in South Korea in which citizens take shelter in buildings and subway stations at the sound of air-raid sirens. Presidential spokesman Kim Eui-keum said the civilian drill could be held as planned, suspended or modified to reflect “changing circumstances.”

The other major U.S. military exercises with South Korea — Key Resolve and Foal Eagle — took place earlier this spring. They historically include live-fire drills with tanks, aircraft and warships and feature about 10,000 American and 200,000 Korean troops. The drills were delayed this year because of North Korean participation in the Winter Olympics in South Korea in February.

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Associated Press writers Lolita C. Baldor in Washington, Mari Yamaguchi in Tokyo and Christopher Bodeen in Beijing contributed to this report.