Germany–Romania relations
Diplomatic relations between Germany and Romania began on 20 February 1880, when, following the Congress of Berlin, the German Empire recognized the independence of the Romanian United Principalities. Romania joined the Axis powers in November 1940, but following the coup d'état of August 1944 switched sides and fought side by side with the Soviets until the Red Army reached Berlin.
Source: Wikipedia — Germany–Romania relations (CC BY-SA 4.0)