What officially ended the World War 2?
lthe Canadian army killed all of the German soldiers and declared the winnig of the second world war
Russia and Japan are officially still at war, and they have been since war was declared in the Second World War. However there hasn't been any military engagements between them since World War 2 ended. Russia and Japan refuse to sign a treaty ending the hostilities between them because of a territorial dispute over the Kuril Islands.
This is not an easy question to answer, because Germany did not officially sign a treaty. General Alfred Jodl of the German High Command signed a Interment of Surrender on VE DAY. The Closest thing to a treaty that was had after World War 2 was the Paris Peace Conference in 1945 which officially ended World War 2 in Europe