North Korea has threatened to back out of a planned summit with the United States and President Donald Trump, according to a Tuesday report from South Korea's Yonhap News Agency.
The North has said it might withdraw from the scheduled talks because the U.S. and South Korea carried out joint military drills. It was also reported that North Korea has canceled its planned talks with South Korea scheduled for Wednesday over drills it claimed were "a rehearsal for invasion of the North and a provocation amid warming inter-Korean ties," according to a Yonhap article citing North Korean state media.
The upcoming summit between North Korean leader Kim Jong Un and Trump is scheduled for June 12 in Singapore. The Washington Post's John Hudson tweeted that a State Department spokesman told him that "North Korea previously accepted the need of military exercises" and that the U.S. was still readying itself for the planned summit. 
The meeting has been seen as chance to help bring peace to the Korean Peninsula, but it also involved a fair amount of risk. The North and the U.S. have traded provocations and threats for quite some time until recent improvements in the relationship.