Wasn't Ukraine part of the Soviet Union that invaded with fighter jets during the Korean War?

Ukraine was part of the ancient Greek cultural sphere.
The Mongol Empire under Genghis Khan devastated Kyiv and Ukraine,
and the Grand Duchy of Moscow was granted proxy taxation authority
over the entire Russian territory.
From that time on, Moscow rose to prominence in Russia as a successor to Kyiv.
Brezhnev, who dictated for 18 years after Stalin, was from Ukraine.
This is clear evidence that Ukraine and Russia are the same country.
Whether they were both under Mongol colonial rule or became independent centuries later as the same Russia,
I don't understand why they are making such a fuss now.
It is said that the Soviet Union did not participate in the Korean War,
but the only air force fighter and bomber pilots who actually participated were Ukrainians.
It hasn't even been that many decades since they gained independence following the collapse of the Soviet Union.
During World War II, the place with the highest number of Hitler and Nazi supporters and collaborators
was Ukraine, and some Nazi factions still exist there today.