Also, I’ve never heard a Communist say that Ukraine belongs to Russia.

I’ve heard Communists say:

• This conflict was provoked by Nato.
• Ukraine has been shifting in a disturbingly fascist direction for the past decade since the “Maidan revolution”.
• The Maidan revolution was a US-sponsored coup.
• Citizens of the Donbas are being oppressed by this increasingly fascist Ukraine, and it’s understandable that some of them would shift their loyalties to Russia.

But I’ve never heard them claim Ukraine belongs to Russia.