The WW2 Pacific Battle for Guadalcanal (Solomon Islands) demonstrates that battles can be won before the first shot is fired by integrating new technology into training.
Decent Harry Truman, thrust into the presidency, kept US afloat in wartime.
Truman became President after the death of President Roosevelt and, despite having little experience, proved more than capable of ending the war against the Japanese and managing the peace in both Europe and Japan after the war.
How Finland held off the Russians and won a moral victory—with lessons for Ukraine
In 1939 the Finns did not collapse when the Soviet Union invaded their country; despite overwhelming odds, the Finns put up spirited resistance— as a result, the Finns were able to remain an independent country.
The Purges in the USSR
In the 1930's Soviet leader Joseph Stalin killed all potential rivals, about half of his officer corps and nearly a million other people who were deemed untrustworthy.
The Soviet Union And The Eastern Front
The battle for Stalingrad was a decisive Soviet victory that boosted Soviet morale and ended a run of Nazi Germany victories.
The Russian Revolution
The Russian Revolution has had a long term, lasting impact on Russia itself and world geopolitics, including the war in Ukraine.
Russia in World War I
During WW1, the Russian Tsar, Nicholas, despite having no military experience, took over direct control of the Russian army—the Russian army was badly defeated by Germany, which resulted in revolution, the murder of the Tsar and his family, and the forming of the Soviet Union.
From May to September 1939, the USSR and Japan fought an undeclared war involving over 100,000 troops. It may have altered world history.
The 1939 Japanese defeat by the Soviets at the Battle of Noonan / Khalkhin Gol may have changed the course of history by convincing the Japanese to attack America instead of the Soviet Union.
In the Russo-Japanese War of 1904-1905, Japan defeated Russia paving the way for its expansion into Korea and Chinese Manchuria.