The European Union won.

They got an excuse to build their own EU army.

The non-EU European states got closer to the EU.

The EU got millions of white immigrants from Ukraine.

Belarus became more neutral instead of pro-Russia.

Serbia and Hungarian populace became more pro-EU. Same for Georgia.

Russia became weaker without direct EU intervention.

The EU secured more Russian immigration to the EU the moment the war is over.

At this rate, Russia is going to end up a member of the European Union by the end of the century, With China as the new boogeyman that replaces Russia.