Trump’s Red Line to Vladimir Putin

NATO will have to shoot down Russian MiGs that enter NATO air space. - The Editorial Board

• America’s allies are investigating mysterious drones over Denmark, and the unease in Europe is growing as Vladimir Putin tests the North Atlantic Treaty Organization with drone and fighter jet incursions. 
• Will President Trump and NATO enforce the red line he’s put down to Mr. Putin?

Asked this week if he thinks NATO should shoot down Russian aircraft and drones that violate allied airspace, Mr. Trump left no ambiguity: “Yes I do.” 

Some 19 drones entered Poland this month, and more recently three MiG-31 fighter jets crossed into Estonia’s airspace...

• But U.S. failure to respond invites more escalation from Mr. Putin.

At a minimum Mr. Trump in response would ratchet up sanctions, seize Mr. Putin’s frozen assets, and sell more weapons to Ukraine. 

“He’s not messing around,” U.S. Ambassador to the United Nations Mike Waltz said this week of Mr. Trump. “The Iranians learned painfully that he will use sticks as well as carrots.”