(Want to get this briefing by email? Here’s the sign-up.)

Good morning.

Here’s what you need to know:

Trump versus NATO

• At the start of the military alliance’s annual summit meeting today in Brussels, President Trump called allies “delinquent” for failing to spend enough on their own defense, and he said Germany was a “captive” of Russia because of its energy dealings.

Here are the latest updates from the start of Mr. Trump’s three-nation European trip, which will include a meeting with President Vladimir Putin of Russia.

On Tuesday, Mr. Trump’s criticism of NATO drew a rebuke from Donald Tusk, the president of the European Council. “Appreciate your allies,” Mr. Tusk said. “After all, you don’t have that many.”