Situation Report

LONDON — The vaccine wars have come to Europe.

For months now, wealthy countries have been clearing the world’s shelves of coronavirus vaccines, leaving poorer nations with little hope of exiting the pandemic in 2021. But a fresh skirmish this week has pitted the rich against the rich — Britain versus the European Union — in the scramble for vials, opening a new and unabashedly nationalist competition that could poison relations and set back collective efforts to end the pandemic.