Trust me on this one it would be South Korea
During the Korean War Japan was occupied by the United States and did not fight on either side, but was used by the US to resupply the United Nations troops in Korea
South Korea
invade korea and fight against ussr
Korea and the US are almost on the very opposite side of the earth.
The US fought for South Korea. they were just to help South Korea because North Korea is invading them.
Korea
The US fought on the Allied, or UN side in Korea.
During the Korean War, the US supported South Korea and their fight against communism. They have supported Korea and their endeavors since.
In the beginning it was NORTH Korea invading SOUTH Korea. Within months of that invasion, the US & UN are involved; in the defense of SOUTH Korea. Communist China enters the war on the side of NORTH Korea, after the US/UN advances too close to their border. NORTH Korea and the Red Chinese are communist nations. SOUTH Korea and the UN are free world nations. The USSR supplies the hardware for the communists to fight with (Tanks, Jets, Artillery, etc.).
South Korea
NATO and mostly us troops