The reason why general douglas macarthur risk landing marines in enemy held territory at incheon was : That territory served as an important point in enemy's supply line.
By landing our troops here, we managed to cut out the supply of enemy's army, which brought a huge outcome that end the war.
The soviets took over those states from the Germans when between 1944 and 1945. at the end of the war, The soviets installed soviet style governments and protected them from the west, weather they wanted it or not and in the process became satellite states.
I believe it’s none of the above because they left from Spain