[tharmas]

This is exactly what it is.

Its to get leverage in Ukraine negotiation talks. And also it helps to make Trump look like a tough guy with his base.

I see at least one downside in that this approach must surely irritate the Danes and they're a NATO ally to boot.

[n4r9]

Maybe. In my experience Danes tend to be very practical and professional people. As long as it stays as just bluster, it probably won't ruffle too many feathers in their political sphere.