What are the objects in the sky the Pentagon is now, finally, after decades, acknowledging? From a historical perspective, assuming current sightings are somehow related to sightings decades ago, the objects cannot be either Chinese or Russian. Not Chinese because decades ago China was a poor nation lacking the industrial, techmological, and scientific bases to build such advanced craft. If he'd had them, Mao would have pursued a much more aggressive foreign policy. Not Russian because we have reports that during the Cold War similar UFOs messed with both American and Soviet ICBM bases/ If Khrushchev, or Kennedy, had had such craft, there would have been no Cuban Missile Crisis.
So,, what are they? We might be forced to an exotic conclusion. Or two. Or more.