FDIC insured up to $250,000 per account. So it’s mainly the little guys who enjoy the protection. FDIC did make all accounts even those over $250,000 whole.
But yes if the Orange Baboon and Electric Hitler decide to fuck with the FDIC I would pull the bulk of my funds and look for offshore safe havens.
Not really feasible. The US has intelligence assets, spy satellites, AWACs, munitions spare parts, etc. that Europe can’t easily replace or doesn’t hold the rights to distribute to Ukraine without US consent.
There is a reason the US doesn’t have universal healthcare.