First of all - they don't allow Ukraine join NATO and don't allow NATO to deploy medium range ballistic missiles there. Second - they protect ethnic-Russian civilian population in the 'liberated' regions from discrimination and genocide. Third - they increase price of the fossil fuel and sell lesser amount of it for a bigger price - which significantly increase their incomes. Fourth - energy poverty in Europe won't allow Europeans to produce significant amount of weapons. Fifth - they prefer to kill anti-Russian nationalists in the open field rather then in Russian cities. More Nazies killed in Ukraine - more safe it is in Russia.
Actually, Russia don't lost 10,000 soldiers a month. Ukraine lost more than 10,000 (more close to 20,000 KIA a month). What is even more important, Ukraine is losing it's population in refugees. 7 million already left Kiev-controlled areas. So, right now, say 20 millions remain there. Kievan regime (not very popular in Ukraine) will be able to conscript (but not properly train) say, 200,000 soldiers. 10 months more and Kievan regime will be out of militants. They already sent poorly trained 'Volksturm' in Donbass. And yes, talking about 'rest of the world' - at least 85% of the Earth population don't care about Ukraine at all, but they do care about safety of their money. The Russian case clearly demonstrated that dollar as a trading currency may be really unreliable.
There are no civil unrests in Russia right now. The Russians (at least 80% of them) support this operation, and at least half of those who don't support the current actions want escalate (to the level of a local, or even regional war), not deescalate it. They don't like when somebody try to genocide them.