Why Russia isn't using it's full force in Ukraine ?
I think the short answer would be that Ukraine is too close to Russia for Russia to even consider using it's most deadly weapons on them. Sure, Russia could nuke Ukraine off the planet, but it would certainly have side effects for their own home as radiation would surely have side effects on their citizens. Not to mention they would absolutely destroy the land they're trying to take. It would make no sense whatsoever. This isn't even touching on the response from other countries.
What are the plans of Russia?
Why is this war? has Russia achieved what they wanted to achieve? If yes -then there is no need to put bombs on innocent civilians. The war is not the solution - it has to stop no matter what.
I strongly agree with you war is not solution of any problem but further aggravates the situation. This war has already created economic problems all over the over the world, fuel $ prices are sky high, inflation is historically high and developing countries like Srilanka are defaulting and many more will fall in the same crisis if this war is not stopped. If Russia is not not using its full force or deadly weapons , it means Putin doesn't want massive killing of human in its neighborhood.