Two Plus Four Treaty
Also called: Treaty on the Final Settlement with Respect to Germany, Two-plus-Four Agreement
The two German states and the US, USSR, Britain and France signed the Treaty on the Final Settlement with Respect to Germany in Moscow, ending the victors’ rights and giving united Germany full sovereignty.

Roland Dumas , Eduard Shevardnadze , Douglas Hurd , James Baker · Public domain · Source
Unification required the consent of the four victorious powers of the Second World War. From May 1990 the foreign ministers of the two Germanys and the four powers met in a series of talks, and in July Chancellor Kohl won Gorbachev’s agreement that a united Germany could remain in NATO.
The treaty signed in Moscow on 12 September fixed united Germany’s borders along the Oder–Neisse line, capped its armed forces at 370,000 and renounced nuclear, biological and chemical weapons. Soviet troops were to leave former East German territory by 1994, and the four powers’ rights over Germany and Berlin came to an end.