Hitler did not invade North Korea.
Hitler did invade the USSR on 22 June 1941.
1941
No
About half of Europe.
Yes
Yes
No
yes
The most of the battles during the WWII were on the territory of Ukraine, for these times Ukraine was not as a country, it was a part of USSR. So Hitler did not conquer Ukraine officially, but some Western parts were under the SS control.
I do not know. all i know is that he invaded the Jews and killed nearly all of them. sadCountriesRussia, checkoslovakia, austriaa, france, Poland, greece, British colonies, Ukraine, Netherlands
Hitler first annexed Austria.