Antidemocratic governments rose to power in eastern post-war Europe on the backs of Soviet tanks.
The Occupation of the Eastern European states was to remain mostly unchanged until the collapse of the Warsaw Pact, due to the weakening and eventual collapse of the Soviet Union, in the eventful years between 1989 and 1991. The Warsaw Pact itself was a sham, put on by the Soviets, to legitimize their puppet-state eastern European governments, and gain an outwardly more willing control of their security forces.
In Asia, a vacuum in power appeared at the end of WWII, in Southeast Asia, since the Japanese Army wasn't defeated in the field there, and withdrew due to the Atomic Bombings of Hiroshima and Nagasaki.
Certain promises were made to the Viet Minh, to grant them their freedom, in return for their support against the Japanese. Double-dealing occurred, and the French were returned to power instead. This gave the more radical elements of the Vietnamese resistance a strong feeling of resentment, which led to rebellion, and the rise of Ho Chi Minh, and the Vietnam wars (VN/FR.) and (NVN/US-SVN)
China was a mess, with power divided between the Nationalists and the Communists. Rival claims to power were made by their leaders, Chang Kai Shek and Mao respectively, which led to civil war, ending in 1949. The Nationalists lost, since they had lost popular support through their well-known corruption, and the better propaganda of Mao's little red book commissars. The Nationalists withdrew to Taiwan, with Chang Kai Shek still claiming power over all of China. This moment of non-closure, due to this General's greed and ego, made it so that Taiwan, only briefly a Chinese island again, after so long being better known as Formosa, lost its chance of declaring themselves an independent country.
Now the tables are reversed, with the mainland Chinese claiming governance over the Taiwanese, and threatening invasion to bring "Their rebellious little province" back under their control.
The problem for them is, in reality, it was NEVER under Chinese communist control, and only briefly under Chinese mainland control.
North Korea was rebelling against the idea of being controlled by their more pro-western South, since it seemed to them that their liberation was due to Chinese, rather than western influences.
The North Koreans saw their chance, and attacked in 1949 to 1953, ending in a ceasefire, since at that time, both sides were proxies of the sides of the new Cold War, and the war could have been endless.
The British had been able to keep the Germans away, in both wars, because of the English Channel. Until the later 1940's, Britain was considered to be the number one naval power in the world, and until aircraft made the huge battleship fleets obsolete, it was simply impossible to get german ships and troops across the channel. It could be said though, that if Goering didn't fail in destroying the RAF in 1940, during the early days of the Battle of Britain, they might have controlled the channel briefly, maybe long enough to get an invasion force across the channel.
In the end though, the British Royal Navy, and later, with the RAF, the "Biggest anti-tank ditch in the world" would remain defiant, and no invasion was possible.