since WW2: Annexation of Tibet, Taiwan Strait Crisis, Sino-Indian War, Sino-Vietnamese War.

Also Korean War, 1959 Tibetan Uprising, Nathu La and Cho La clashes, Sino-Soviet Border Conflict, Paracel Islands conflict, Sino-Vietnam border clashes, Johnson South Reef Skirmish, China–India border clashes (Galwan), South China Sea standoffs.