Military conflicts similar to or like World War II

Conflict fought by Finland and Nazi Germany, against the Soviet Union from 1941 to 1944, as a part of World War II. Called the Finnish Front of the Great Patriotic War. Wikipedia

The Soviet invasion of Manchuria, formally known as the Manchurian Strategic Offensive Operation (Манчжурская стратегическая наступательная операция, Manchzhurskaya Strategicheskaya Nastupatelnaya Operatsiya) or simply the Manchurian Operation (Маньчжурская операция), began on 9 August 1945 with the Soviet invasion of the Japanese puppet state of Manchukuo. The largest campaign of the 1945 Soviet–Japanese War, which resumed hostilities between the Union of Soviet Socialist Republics and the Empire of Japan after almost six years of peace. Wikipedia

Accomplished by a combination of diplomatic, political, and military engagements including internal resistance, during the Second World War in which France was progressively liberated. Accomplished by the combined efforts of Free French forces based in London and North Africa, the Allied military forces, and the actions of the French Resistance inside the country. Wikipedia

Name given to the strategic defensive aerial campaign fought by the Luftwaffe air arm of the combined Wehrmacht armed forces of Nazi Germany over German-occupied Europe and Nazi Germany during World War II. To prevent the destruction of German civilians, military and civil industries by the Western Allies. Wikipedia

Military campaign in the Mediterranean Theatre. From June 1940 to November 1942, the fight for the control of the strategically important island of the British Crown Colony of Malta pitted the air forces and navies of Fascist Italy and Nazi Germany against the Royal Air Force (RAF) and the Royal Navy. Wikipedia

War between North Korea (with the support of China and the Soviet Union) and South Korea (with the support of the United Nations, principally from the United States). The war began on 25 June 1950 when North Korea invaded South Korea following clashes along the border and insurrections in the south. Wikipedia

The sustained aerial attack on railways, harbours, cities, workers' and civilian housing, and industrial districts in enemy territory during World War II. Military strategy which is distinct from both close air support of ground forces and tactical air power. Wikipedia

The North African campaign of the Second World War took place in North Africa from 10 June 1940 to 13 May 1943. It included campaigns fought in the Libyan and Egyptian deserts (Western Desert Campaign, also known as the Desert War) and in Morocco and Algeria (Operation Torch), as well as Tunisia (Tunisia Campaign). Wikipedia

War between the Soviet Union and Finland. It began with a Soviet invasion of Finland on 30 November 1939, three months after the outbreak of World War II, and ended three and a half months later with the Moscow Peace Treaty on 13 March 1940. Wikipedia

The Soviet occupation of Bessarabia and Northern Bukovina took place from June 28 to July 4, 1940, as a result of the ultimatum by the Soviet Union to Romania on June 26, 1940, that threatened the use of force. District of the Romanian Old Kingdom. Wikipedia

The Italian campaign of World War II, also called the Liberation of Italy, consisted of Allied and Axis operations in and around Italy, from 1943 to 1945. Operationally responsible for all Allied land forces in the Mediterranean theatre and it planned and led the invasion of Sicily in July 1943, followed in September by the invasion of the Italian mainland and the campaign in Italy until the surrender of the German Armed Forces in Italy in May 1945. Wikipedia

Fought in East Africa during the Second World War by Allies of World War II, mainly from the British Empire, against Italy and its colony of Italian East Africa, between June 1940 and November 1941. The British Middle East Command with troops from the United Kingdom, South Africa, British India, Uganda Protectorate, Kenya, Somaliland, West Africa, Northern and Southern Rhodesia, Sudan and Nyasaland participated in the campaign. Wikipedia

The Battles of Khalkhin Gol were the decisive engagements of the undeclared Soviet–Japanese border conflicts fought among the Soviet Union, Mongolia, Japan and Manchukuo in 1939. Named after the river Khalkhin Gol, which passes through the battlefield. Wikipedia

The German invasion of France, Belgium, Luxembourg and the Netherlands during the Second World War. On 3 September 1939, France had declared war on Germany, following the German invasion of Poland. Wikipedia

The code name for the Axis invasion of the Soviet Union, which started on Sunday, 22 June 1941, during World War II. The operation put into action Nazi Germany's ideological goal of conquering the western Soviet Union so as to repopulate it with Germans. Wikipedia

Civil war in China fought between the Kuomintang -led government of the Republic of China (ROC) and the Communist Party of China (CPC) lasting intermittently between 1927 and 1949. Generally divided into two phases with an interlude: from August 1927 to 1937, the KMT-CPC Alliance collapsed during the Northern Expedition, and the Nationalists controlled most of China. Wikipedia

Civil war in Spain fought from 1936 to 1939. Alliance of Falangists, monarchists, conservatives and traditionalists, led by a military group among whom General Francisco Franco soon achieved a preponderant role. Wikipedia

The Battle of the Atlantic, the longest continuous military campaign in World War II, ran from 1939 to the defeat of Nazi Germany in 1945, covering a major part of the Naval history of World War II. The Allied naval blockade of Germany, announced the day after the declaration of war, and Germany's subsequent counter-blockade. Wikipedia

The Allied amphibious landing on mainland Italy that took place on 3 September 1943 during the early stages of the Italian campaign of World War II. Undertaken by General Sir Harold Alexander's 15th Army Group and followed the successful Allied Invasion of Sicily. Wikipedia

British-led Allied military campaign during the Second World War against the Kingdom of Iraq under Rashid Ali, who had seized power in the 1941 Iraqi coup d'état, with assistance from Germany and Italy. The campaign resulted in the downfall of Ali's government, the re-occupation of Iraq by the British, and the return to power of the Regent of Iraq, Prince 'Abd al-Ilah, a British ally. Wikipedia

Military campaign of the Second World War, in which the Royal Air Force (RAF) and Fleet Air Arm (FAA) of the Royal Navy defended the United Kingdom (UK) against large-scale attacks by Nazi Germany's air force, the Luftwaffe. It has been described as the first major military campaign fought entirely by air forces. Wikipedia

Undeclared border conflict fought between the Soviet Union and Japan in Northeast Asia from 1932 to 1939. Japanese expansion in the Northeast China region bordering the Soviet Far East and disputes over the demarcation line led to growing tensions with the Soviet Union, with both sides often violating the border and accusing each other of border violations. Wikipedia

Intelligence program developed by the United States during the Second World War as a form of economic warfare against Germany and its Axis partners. Designed and carried out by the US partnered with Great Britain and France. Wikipedia

The name given to the naval campaign fought in the Mediterranean Sea during World War II, from 10 June 1940 to 2 May 1945. Fought between the Italian Royal Navy , supported by other Axis naval and air forces, and the British Royal Navy, supported by other Allied naval forces, such as Australia, the Netherlands, Poland and Greece. Wikipedia