"The ultimatum follows Trump’s announcement last week that the United States will withdraw from the Paris climate change accord and his refusal to specifically pledge allegiance to European defense at a NATO summit last month."
Trump has never said the US would not defend Europe. Never. Ever. Ever.
Obama did however - he stopped a missile defense shield to Poland, thus leaving it open to Russia ... and he did that as a capitulation to Russia.
Obama did do that ... multiple times to Eastern European allies, leaving them to their own devices, to find their own defense systems.
Obama did that many times. He said one thing and did another and NEVER once did the WP question him. Anne should pay more attention.
But when Trump tells the European allies they need to pay their legitimate and legally obligated portion as defined by the very treaty he isn't obliging, then he is apparently not pledging allegiance to the Euro cause.
We have defended Europe, even when Europe didn't want our protection - we liberated them -- we did so despite cost and the lives lost. We will always do so, but they MUST pay their fair share.
We have always paid more than our share. Always.