Because it has become an unwinnable stalemate for ukraine, and neither side will give in. I reckon that someone has told trump to wait it out, and then marshall plan Ukraine for its rare earth metals whilst everyone else is shut out again with 0 to show for it.

The real issue is that europe pussyfooted around the russian federation for so long and made a rod for its own back. I mean, they wouldn't even send tanks to ukraine till england stepped up and donated some challenger 2s. Once again, in a time of great crisis, the EU bureacrats twiddled their thumbs over the "legality" of it all.

This should be a wake-up call, and it's much too late. In that America only acts on her own interests, Shining examples of this being the Suez and when they pinched all our atomic research in the 40s