Lin Wood posted a closeup of one of the flags behind POTUS during the sendoff speech: link

It appears to me that the border on the flag is solid, not fringe. However, if you watch the video, you'll see that the rest of the flags are fringed. Could this be the new American Flag?

Additionally, What if biden becomes POTUS

As Q says, "WOULD UKRAINE/CHINA OWN AND CONTROL THE WHITE HOUSE?". Yes, I believe they would, and that would certainly qualify as a foreign power controlling the presidency. I believe that would warrant military intervention.

Perhaps a fraudulent election is not enough to satisfy certain legal conditions, but a sworn, sitting president who is under the sway of foreign powers is enough. Maybe that's why the inauguration had to go through.