undeclared war
military conflict between two or more nations without either side issuing a formal declaration of war
Russo-Ukrainian War
armed conflict between Russia and Ukraine since 2014
Sino-Soviet border conflict
1969 undeclared conflict between USSR and People's Republic of China
Russian invasion of Ukraine
ongoing military conflict in Eastern Europe since 2022
Actions in Inner Mongolia
military operations in northern China by Japan prior to the official start of hostilities in the Second Sino-Japanese War
Anti-Terrorist Operation in Ukraine
set of organizational and legal measures during the war with Russia in eastern Ukraine