The United States has told Japan it may resume large-scale joint military exercises with South Korea as early as next spring, if there continues to be no tangible progress on the denuclearization of North Korea, Japanese government sources said Monday.

Since September, the administration of President Donald Trump has communicated its plan to Japan a few times, according to the sources.

Japan, which has called on the international community to maintain pressure on Pyongyang, is supportive of the United States' latest stance on the annual military drills, which Trump indefinitely suspended following his first-ever summit with North Korean leader Kim Jong Un, in mid-June in Singapore.