Has Russia gone completely insane or what?

Here is the latest diplomatic note from Russia to Poland:

Moscow lashed out at Washington and Warsaw on Friday, saying the plan to site a US anti-missile defence shield in Poland would undermine the global balance of power and put Poland at risk of nuclear attack.

Washington and Warsaw reached a preliminary agreement on Thursday to build part of the missile defence shield in Poland, station US Patriot missiles there and bolster the two countries’ military co-operation.

The US claims the shield in Poland, as well as a radar tracking base to be located in the Czech Republic, is designed to defend against “rogue states” such as Iran.

Russia is basically telling Poland, "Stop building your anti-nuclear defenses, or we'll nuke you." Yeah, that makes a lot of sense.