The Democratic People's Republic of Korea's (DPRK) media reported on Monday that leader Kim Jong Un supervised air force drills for the second time in three days, even as the United States and the Republic of Korea (ROK) decided to postpone their joint air drills to ease denuclearization talks with Pyongyang.

The U.S. and the ROK said on Sunday they would postpone upcoming military drills, known as the Combined Flying Training Event, in an effort to bolster a stalled peace push with DPRK. Washington denied the move amounted to another concession to Pyongyang.

The drills, already planned to be scaled back from previous years, would have simulated air combat scenarios and involved an undisclosed number of warplanes from both the United States and the ROK to test readiness.

On Monday, DPRK state news agency KCNA said Kim supervised an airborne landing training of sharpshooter sub-units of the Air and Anti-Aircraft Force of the DPRK army.

Kim "said that it is necessary to wage a drill without notice under the simulated conditions of real war" for "improving the preparedness" of DPRK military units, KCNA said.

On Saturday, KCNA had reported that Kim watched a "combat flight contest" of the flight commanding officers of the Air and Anti-Aircraft Force. A photo in state newspaper Rodong Sinmun showed him smiling amid pilots gathered around him.

It was unclear when Kim oversaw these events, or whether it was on the same day. There was no mention of the U.S. or the ROK in the KCNA reports.

U.S. President Donald Trump on Sunday told Kim, "You should act quickly, get the deal done" with the United States, and signed off "See you soon!" on Twitter.