In another post, Trump is seen hoisting a US flag in Greenland, with a milepost that reads, "Greenland US Territory Est 2026".
The North American Aerospace Defence Command (NORAD) intercepted a group of bombers near Alaska, marking the first instance of joint Russian and Chinese operations prompting such a response from the United States, CNN reported, citing, a United States defence official.
The development comes after the United States and Canada shot down three high-altitude airborne objects in recent days.
The United States scrambled a F-15 fighter jet and intercepted a two-seat civilian plane flying into restricted airspace over Camp David where President Barack Obama and family were holidaying.
The exercise under the codename Vigilant Eagle, was carried out between August 6-11 under a cooperative military agreement between Russia and the US, which tasks NORAD, the bi-national US and Canadian command, and the Russian Air Force to conduct a live-flying exercise for up to five days, RIA Novosti reported.
In a press briefing, Air Force General Glen VanHerck, who safeguards United States airspace as head of North American Aerospace Defence Command (NORAD) and Northern Command, said, "We're calling them objects, not balloons, for a reason."
United States fighter jets on Saturday shot down an unidentified, unmanned high-altitude airborne object over northern Canada that had entered its airspace from Alaska, President Joe Biden said.
The US Pacific Command said the missiles appeared to be short-range. The first and second missiles "failed in flight" and the third "appears to have blown up almost immediately".
The Japanese government warned the people in northern Japan to prepare for a potential incoming missile from Pyongyang.
Earlier, United States Secretary of State Rex Tillerson urged the international community to increase pressure on North Korea, saying that failing to do so would bring 'catastrophic consequences'.
Seoul said North Korea launched the missile apparently to 'provoke' Trump.
The US president's remarks came in response to the latest ballistic missile test conducted by North Korea on Friday.
United States President Barack Obama has condemned deadly shootings in Canada and offered assistance in the wake of the attacks in Ottawa that left 1 soldier dead.
The missile was launched at 23:41 North Korea time from Jagang province in the north of the country, South Korean news agency Yonhap reported.
India and the United States discussed a host of issues, including the security situation in South Asia, East China Sea, anti-piracy operations and America's help in developing two new commands -- space and cyber, during a recent visit of Air Chief Marshal N A K Browne in Washington.