The U.S. and South Korea announced Tuesday that a toned-down version of annual joint military drills would begin April 1 amid a potentially monumental thaw in ties with nuclear-armed North Korea that could see the allies' two leaders hold separate summits with North Korea's Kim Jong Un.

The main Foal Eagle field exercise, which usually lasts two months, is scheduled to begin April 1 and last for a month, while the computer-simulated Key Resolve tabletop drills will be held for two weeks starting in mid-April, a South Korean military official was quoted as saying.

The joint drills had been postponed for the Pyeongchang Winter Olympics.