War of aggression in the context of "War of extermination"

Between 28 June and 3 July 1940, the Soviet Union occupied Bessarabia and Northern Bukovina, following an ultimatum made to Romania on 26 June 1940 that threatened the use of force. Those regions, with a total area of 50,762 km (19,599 sq mi) and a population of 3,776,309 inhabitants, were incorporated into the Soviet Union. On 26 October 1940, six Romanian islands on the Chilia branch of the Danube, with an area of 23.75 km (9.17 sq mi), were also occupied by the Soviet Army.

The Soviet Union had planned to accomplish the annexation with a full-scale invasion, but the Romanian government, responding to the Soviet ultimatum delivered on 26 June, agreed to withdraw from the territories to avoid a military conflict. The use of force had been made illegal by the Conventions for the Definition of Aggression in July 1933, but from an international legal standpoint, the new status of the annexed territories was eventually based on a formal agreement through which Romania consented to the retrocession of Bessarabia and cession of Northern Bukovina. As it was not mentioned in the ultimatum, the annexation of the Hertsa region was not consented to by Romania, and the same is true of the subsequent Soviet occupation of the Danube islands. On 24 June, Nazi Germany, which had acknowledged the Soviet interest in Bessarabia in a secret protocol to the 1939 Molotov–Ribbentrop Pact, had been made aware prior to the planned ultimatum but did not inform the Romanian authorities and was unwilling to provide support. On 22 June, France, a guarantor of Romanian borders, fell to Nazi advances. This is considered to be an important factor in the Soviets' decision to issue the ultimatum. The Soviet invasion of Bukovina in 1940 violated the Molotov-Ribbentrop Pact, since it went beyond the Soviet sphere of influence that had been agreed with the Axis.

The Second Italo-Ethiopian War, also referred to as the Second Italo-Abyssinian War, was a war of aggression waged by Italy against Ethiopia, which lasted from October 1935 to February 1937. In Ethiopia it is often referred to simply as the Italian Invasion (Amharic: ጣልያን ወረራ, romanized: Ṭalyan warära; Oromo: Weerara Xaaliyaanii), and in Italy as the Ethiopian War (Italian: Guerra d'Etiopia). It is seen as an example of the expansionist policy that characterized the Axis powers and the ineffectiveness of the League of Nations before the outbreak of World War II.

On 3 October 1935, two hundred thousand soldiers of the Italian Army commanded by Marshal Emilio De Bono attacked from Eritrea (then an Italian colonial possession) without prior declaration of war. At the same time a minor force under General Rodolfo Graziani attacked from Italian Somalia. On 6 October, Adwa was conquered, a symbolic place for the Italian army because of the defeat at the Battle of Adwa by the Ethiopian army during the First Italo-Ethiopian War. On 15 October, Italian troops seized Aksum, and an obelisk adorning the city was torn from its site and sent to Rome to be placed symbolically in front of the building of the Ministry of Colonies.

The International Military Tribunal for the Far East (IMTFE), also known as the Tokyo Trial and the Tokyo War Crimes Tribunal, was a military trial convened on April 29, 1946 to try leaders of the Empire of Japan for their crimes against peace, conventional war crimes, and crimes against humanity, leading up to and during World War II. The IMTFE was modeled after the International Military Tribunal (IMT) at Nuremberg, Germany, which prosecuted the leaders of Nazi Germany for their war crimes, crimes against peace, and crimes against humanity.

Following Japan's defeat and occupation by the Allies, the Supreme Commander for the Allied Powers, United States General Douglas MacArthur, issued a special proclamation establishing the IMTFE. A charter was drafted to establish the court's composition, jurisdiction, and procedures; the crimes were defined based on the Nuremberg Charter. The Tokyo War Crimes Tribunal was composed of judges, prosecutors, and staff from eleven countries that had fought against Japan: Australia, Canada, China, France, India, the Netherlands, New Zealand, the Philippines, the Soviet Union, the United Kingdom, and the United States; the defense consisted of Japanese and American lawyers. The Tokyo Trial exercised broader temporal jurisdiction than its counterpart in Nuremberg, beginning from the 1931 Japanese invasion of Manchuria. Twenty-eight high-ranking Japanese military and political leaders were tried by the court, including current and former prime ministers, cabinet members, and military commanders. They were charged with fifty-five separate counts, including the waging wars of aggression, murder, and various war crimes and crimes against humanity (such as torture and forced labor) against prisoners-of-war, civilian internees, and the inhabitants of occupied territories; ultimately, 45 of the counts, including all the murder charges, were ruled either redundant or not authorized under the IMTFE Charter. The Tokyo Trial lasted more than twice as long as the better-known Nuremberg trials, and its impact was similarly influential in the development of international law; similar international war crimes tribunals would not be established until the 1990s.

In geopolitics, an invasion typically refers to a military offensive in which a polity sends combatants, usually in large numbers, to forcefully enter the territory of another polity, with either side possibly being supported by one or more allies. While strategic goals for an invasion can be numerous and complex in nature, the foremost tactical objective normally involves militarily occupying part or all of the invaded polity's territory. Today, if a polity conducts an invasion without having been attacked by their opponent beforehand, it is widely considered to constitute an international crime and condemned as an act of aggression.

Historically, invasions have variously been associated with conquest and annexation, self-defence (if the invader was attacked first), liberation of the invaded polity's people (or of territory that had been occupied by it), or the establishment or re-establishment of control or authority over a territory. Other common motives include forcing the partition of a polity, toppling or altering the established government of a polity or gaining concessions from said government, or intervening to support a belligerent in a polity's civil war.

A crime of aggression or crime against peace is the planning, initiation, or execution of a large-scale and serious act of aggression using state military force. The definition and scope of the crime is controversial. The Rome Statute contains an exhaustive list of acts of aggression that can give rise to individual criminal responsibility, which include invasion, military occupation, annexation by the use of force, bombardment, and military blockade of ports. In general, committing an act of aggression is a leadership crime that can only be committed by those with the power to shape a state's policy of aggression, as opposed to those who discharge it.

The philosophical basis for the wrongness of aggression is found in just war theory, in which waging a war without a just cause for self-defense is unjust. In the wake of the German invasion of the Soviet Union during World War II, Soviet jurist Aron Trainin made the first successful proposal to criminalize aggression. The Charter of the International Military Tribunal provided criminal liability for waging aggressive war, which was the main focus of the Nuremberg trial. Other participants in World War II were tried for aggression in Finland, Poland, China, the subsequent Nuremberg trials, and the Tokyo trial. No one has been prosecuted for aggression either before or since the 1940s.

The Stimson Doctrine is the policy of nonrecognition of states created as a result of a war of aggression. The policy was implemented by the United States government, enunciated in a note of January 7, 1932, to the Empire of Japan and the Republic of China, of nonrecognition of international territorial changes imposed by force. The doctrine was an application of the principle of ex injuria jus non oritur. Since the entry into force of the United Nations Charter, international law scholars have argued that states are under a legal obligation not to recognize annexations as legitimate, but this view is controversial and not supported by consistent state practice.

Named after Henry L. Stimson, U.S. Secretary of State in the Herbert Hoover administration (1929–1933), the policy followed Japan's unilateral seizure of Manchuria in northeastern China following action by Japanese soldiers in Shenyang on September 18, 1931. The doctrine was also invoked by U.S. Undersecretary of State Sumner Welles in the Welles Declaration on July 23, 1940, which announced nonrecognition of the Soviet annexation and incorporation of the three Baltic states: Estonia, Latvia, and Lithuania. This remained the official U.S. position until the Baltic states regained independence in 1991.

Alfred Josef Ferdinand Jodl (German: [ˈjoːdl̩] ; born Alfred Josef Baumgärtler; 10 May 1890 – 16 October 1946) was a German Army Generaloberst (the rank was equal to a four-star full general) and convicted war criminal, who served as the Chief of the Operations Staff of the Oberkommando der Wehrmacht – the German Armed Forces High Command – throughout World War II.

After the war, Jodl was indicted on charges of conspiracy to commit crimes against peace, planning, initiating and waging wars of aggression, war crimes, and crimes against humanity at the Allied-organized Nuremberg trials. The principal charges against him related to his signing of the criminal Commando and Commissar Orders. Found guilty on all charges, he was sentenced to death and executed in Nuremberg in 1946.