We actually do see the US and UK sharing vaccine formulas and production techniques on limited basis. However, everyone is scrambling and hoarding lab equipment like pipettes which are in short supply globally. The storm in Texas interrupted global supply of petrochemicals used to make those plastics, COVID is slowing do production in SE Asia, trade weirdness has containers in all the wrong places right now, and in general demand is WAY up everywhere.

Fundamentally its a question of values, what do you think a nation state should do for its own people weighed against its obligations to the rest of the world.