Biden heads to UK ahead of NATO summit that will test unity

President Joe Biden flew to London on Sunday where he’ll discuss the environment with King Charles III and meet with U.K. Prime Minister Rushi Sunak regarding the war in Ukraine.

The conversation with Sunak is a precursor for more intense talks later this week, when NATO leaders convene in Lithuania for their annual summit.

First and foremost on the NATO agenda: strengthening the alliance in the face of the Russian invasion and deciding whether to approve Sweden’s bid to join the pact.

The Biden administration is backing Sweden’s membership but...