No it isn't.
You don't have anything official that says those regions are a part of Russia, though there is plenty of official shit that establishes those regions as part of Ukraine.
The USSR thought that it was Ukrainian territory, so you are now also in conflict with what the USSR said, back when it existed.
The Russia of today is only about 30 years old and has no legitimate claim to anything outside of its borders.
not that it's going to make any difference as the Russians have a Security Council veto. So does Russia's backer, China. What America does for Israel so Russia and China will always do for their own interests.
You can kiss ALL territories which voted to 'leave Ukraine ' goodbye.
How is that going to happen when Russia is clearly losing this war?
Unlike the occupied Palestinians, the populations of the Donbas and Crimea voted to rejoin/align with Russia.
That referendum didn't poll all the people in those regions, was illegal under Ukrainian law, and was not recognized by any international body.
If Israel did the same poll of Israelis in WB, it would turn the same result.
So it's hypocritical that you attack Israel for making the same claims to WB and Gaza that Russia makes to Crimea and Donbass.
It's a situation which makes their wishes legitimate. The law states that territory can never be taken/annexed BY FORCE.
Again, no points for your half-assed grasp of events and the law.
You can't prove that referendum was legitimate, mostly because it didn't poll all the people who lived there.
Also, if they want to live in Russia so bad, then move there.
The Donbas already declared independence. Russia recognized it. Crimea was legally Russian anyway.
No one else has recognized that, no one else thinks it's legitimate.
You're also a hypocrite.