Yes, he spoke on it at the Munich Security Conference, to frequent applause

Yes (I don't know why you were downvoted), and others, but unfortunately I find it highly unlikely to happen. Or at least, it'll only happen when it's already too late, and Russia starts steamrolling more of Europe while the US does nothing (or actively supports it - the current admin is highly pro Russia).

The US is no longer a reliable ally to the EU or NATO. The EU must be able to protect itself.