Amazingly illogical, and wrong!
Ukraine, as a separate territory, was a founding member of the UN in 1945 on the same day as the USSR. Ukraine's official name was the Ukrainian Soviet Socialist Republic. This was at the insistence of, you got it, the USSR.
Ukraine was again granted full independence on August 24, 1991 by a vote of 321 to 2 by Supreme Soviet (parliament) of the Ukrainian SSR. On Dec 2, the Russian SFSR further recognized Ukraine's independence.
In history, Ukraine was a great state when Moscow was still open grassland.
Ukraine is and has always been Ukraine.