Land was not "once Russian", it was occupied by the Russians, with the population being Ukrainian.
Great way to start WW3 if you allow countries in Europe to start claiming lands they once conquered.
Soviet 1926 census map showing ethnicity
Soviet 1926 census map showing ethnicity
bkmk
You are going to give us a Hah-vud map drawn up at the hight of the CIA coup in the Ukraine? That map is a product of a misinformation campaign made in an attempt to delegitimize Russian and Russians.
Next you will be telling us the Ukrainians are actually Han Chinese.