Hungary–Romania relations
During World War II, Hungary and Romania became allies and participated in the war against the Soviet Union. But after the coup on 23 August 1944 Romania switched sides and fought against Hungary. Consequently, Soviet and Romanian troops invaded Hungary, occupied Northern Transylvania by October 1944 and re-established the Romanian administration in the region in March 1945. The 1947 Treaty of Paris reaffirmed the borders between Romania and Hungary as originally defined in Treaty of Trianon 27 years earlier, thus confirming the return of Northern Transylvania to Romania.
Romania in World War II
The report commissioned and accepted by the Romanian government in 2004 on the Holocaust concluded:
"Of all the allies of Nazi Germany, Romania bears responsibility for the deaths of more Jews than any country other than Germany itself. The murders committed in Iasi, Odessa, Bogdanovka, Domanovka, and Peciora, for example, were among the most hideous murders committed against Jews anywhere during the Holocaust. Romania committed genocide against the Jews. The survival of Jews in some parts of the country does not alter this reality."