He noted that in the past two weeks, NORAD has identified four aircraft in the airspace of the United States and Canada.

“The first was officially identified as a high-altitude reconnaissance balloon of the PRC, the affiliation of the remaining three cannot be determined at the moment,” Prevost TASS quoted Prevost as saying.

Earlier, White House National Security Council (NSC) strategic communications coordinator John Kirby said that US leader Joe Biden ordered the formation of an interagency team to study the circumstances of the appearance of unidentified objects in US airspace.