The remarkable revelation comes after previous warnings about countries such as Russia possibly weaponizing a global frontier long agreed in treaties to be used for only peaceful purposes.

Ed Sheeran's tour of North and South America was plunged into chaos when four of his supporting acts quit in solidarity with the rapper Macklemore, who was dropped for making pro-Palestinian comments.

A news helicopter used by NBC and Telemundo crashed in a Los Angeles neighborhood on Tuesday, killing at least three people while reporters were covering the nearby crash of an SUV and a city bus.