President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE and South Korean President Moon Jae In on Friday pledged to continue a regime of diplomatic and economic pressure on North Korea, and Trump gave "conceptual approval" to a multi-billion dollar military equipment sale to South Korea.

"The two leaders agreed to strengthen our alliance through defense cooperation and to strengthen South Korea’s defense capabilities," according to the White House.

The phone call came a day after the U.S. and South Korea concluded annual joint military exercises in the region by flying two B-1B supersonic bombers and a bevy of fighter jets over the Korean Peninsula in a show of force against Pyongyang.

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"President Trump provided his conceptual approval of planned purchases by South Korea of billions of dollars in American military equipment," the White House statement added. Details were not immediately available.

Tensions between Washington and Pyongyang have boiled over in recent months amid rapid developments in North Korea's nuclear weapons and missile programs.

After news emerged last month that North Korea had developed a miniaturized nuclear warhead capable of fitting on one of its missiles, Trump warned that he would unleash "fire and fury" if the country continued to threaten the U.S.

That threat prompted a war of words between Trump and North Korea. The country conducted its latest missile test on Monday. That missile flew over Japan, prompting the Japanese government to warn its citizens to take cover.

North Korean leader Kim Jong Un Kim Jong UnSatellite images indicate North Korea preparing for massive military parade South Korea warns of underwater missile test launch by North Korea Trump says he didn't share classified information following Woodward book MORE said after that launch that his country would seek to conduct more missile tests in the Pacific.