For the US to stop -without warning- Ukraine arms overnight, including arms already in Poland on route to the front line, giving no time for Ukraine to find new supplies, is so damaging it looks like an act of war.
USA for over 80 years has demanded to be the centre and foundation of Western security –it’s ok if it no longer wants to take that role– but to halt arms overnight is like switching sides; this helps Russia beyond their wildest dreams. How can any country (incl UK) trust USA again?