North Korea's top three military officials have been removed from their posts, a senior U.S. official said, a move analysts said Monday could support efforts by the North's young leader to jump-start economic development and engage with the world.

Kim Jong Un is preparing for a high-stakes summit with U.S. President Donald Trump in Singapore on June 12, the first such meeting between a North Korean leader and a sitting U.S. president.

The U.S. official, who spoke on condition of anonymity, was commenting on a report by South Korea's Yonhap news agency that all three of the North's top military officials were believed to have been replaced.