It is time to really go hard against Russia.
This is rather unlikely. You can't go too hard on a nuclear superpower. This is not early WW2; nukes changed everything. The most likely scenario is that after a bloody fight in Donbass and marginal Russian victory an agreement between Ukraine and Russia is signed: Russia gets Crimea together with a sizeable corridor to it along the Black Sea coast, as well as a huge chunk of eastern Ukraine.
What such, most likely, scenario would mean for those interested? Let's see...
1.
Russia: they achieve limited success, which allows them to terminate their "special operation", get out of it with face (although "face" is a debatable term considering what they did in Bucha and other places) and avoid total military and economic disaster. EU/US sanctions continue but they are partly made up for by increased cooperation with China. Russia becomes a de facto Chinese vassal, but nobody in Russia knows about it - the propaganda sells people a huge victory, there are some territorial gains, one can again buy sugar and bread without queuing for hours; in short - "победа!", "uurrraaa!" etc. etc.
So, a win (kinda).2.
Ukraine: They lose some territory, but the slaughter of their civilian population stops and with western help they begin to rebuild their country. They have to declare military neutrality, so no NATO for them, but they will be accepted into the EU, and the smaller Ukraine slowly but surely starts going the Polish way and becomes a relatively stable and successful country.
So, a win.3.
Poland: most of Ukrainians stay in our country, strengthening our job market and demographics. Polish army increases in number to 300,000 and is equipped with the best (mostly American) weapons. It costs sh*tloads of money, but hey - there's no price too high for safety, right? In the east we have an independent Ukraine which is constantly hostile towards Russia with a huge grudge to bear for another 100 years or so; not so weak as to become an easy prey for Russia and not too strong to become a threat to Poland.
So, a win.
4.
NATO: it is revived and strengthened by the "great come back" of the old enemy. All member countries spend at least 2% of their GDP on defence, and we welcome two new members: Finland and Sweden.
So, a win.5.
The EU: the ban on Russian oil and gas speeds up the transition to green renewable sources of energy and the Union in general comes out strengthened and more united from the conflict. We welcome new members: Ukraine, Norway, Moldova, Bosnia, Montenegro, Kosovo, Macedonia, Albania, Iceland and, after much bit*ching and pouting the UK again, creating a fully united continent - one of huge superpowers in the new multipolar world.
So, a win.
6.
China: they are allowed to take Taiwan (of course after much bit*ching and pouting from the West to keep up appearances) and gain a new vassal in the north. Their potential increases even more and they become one of the huge superpowers in the new multipolar world.
So, a win.7.
Serbia: after a deal between Russia and Ukraine is signed Serbia says it's a scandal and demands that Russia continues the "denazification" of Ukraine until the end. After Russia refuses Serbia breaks all diplomatic ties with them, as well as with the US and the EU. People take to the streets to protest and the government collapses. Vojvodina goes back to Hungary, Partizan Belgrade is relegared to 2nd division, and Crow emigrates to Germany.
So, a loss.