An incomplete list of post-1945 wars which involved one country attacking another country.
1946-1954 The French Indochina War in Vietnam
1948-1949 Arab-Israeli War
1950-1953 Korean War
1953 Soviet invasion of East Germany
1955-1975 US war in Vietnam
1956 Soviet suppression of the Hungarian revolt
1956 Suez War
1958-1959 North Vietnamese invasion of Laos
1958-1959 Mexico-Guatemala war
1959 Chinese suppression of the Tibetan uprising
1959 Cuban invasion of Panama
1959 Cuban invasion of the Dominican Republic
1961 US invasion of Cuba (Bay of Pigs)
1961-1962 French Algerian War
1961 Indian annexation of Goa
1962 Sino-Indian War
1963 Cuban invasion of Venezuela
1965-1966 USA invasion of Dominican Republic
1965 Indo-Pakistan War
1967 Israel-Arab War
1968 Invasion of Czechoslovakia by Soviet forces
1971 Bangladesh war of independence
1972 Invasion of Uganda
1973 Israeli-Arab War
1974-1975 Iraqi-Kurdish War
1974 Turkish invasion of Cyprus
1975-1976 Indonesian invasion of East Timor
1977 Egypt-Libya War
1978 Israeli invasion of Lebanon
1978-1979 Uganda-Tanzania War
1979-1989 Soviet invasion of Afghanistan
1980-1988 Iran-Iraq War
1982 Falklands War
1982 Israeli invasion of Lebanon
1983 USA invasion of Grenada
1986 USA bombing of Libya
1988-1994 First Nagorno-Karabakh war
1988 Indian intervention in the Sr- Lankan Civil War
1989-1990 USA invasion of Panama
1990-1991 First Gulf War
1990-1992 Transnistria War
1991-1992 South Ossetia War
1991-1995 Yugoslav Wars
1992-1995 Bosnian War
1994-1996 First Chechen War
1998- Saudi-Yemeni border dispute
1999-2009 Second Chechen War
2001-2021 USA invasion of Afghanistan
And an incomplete list of conflicts in which a foreign power sought to increase its influence and benefit from a conflict by supporting violence and civil war in another country.
1953 Overthrow of the Iranian democratic government by the USA and UK
1954-1962 French war in Algeria
1955-1959 Cyprus rebellion against British rule
1960-1965 Congo War
1961-1964 Angolan War of Independence
1961-1970 First Iraq-Kurdish War
1963-1998 The Troubles (Northern Ireland)
1973 Chilean coup d’etat
1974-1983 The ‘Dirty War’ of Argentina