The NATO Expansion Debate

The 'Broken Promise' Debate

Few questions in modern diplomacy are as contested as whether the West promised not to expand NATO eastward. The debate centers on a February 9, 1990 meeting between US Secretary of State James Baker and Soviet leader Mikhail Gorbachev, where Baker reportedly said NATO would expand 'not one inch eastward' in the context of German reunification.

The Russian argument: Baker's assurance was a binding commitment. NATO's subsequent expansion — Poland, Hungary, and the Czech Republic in 1999; the Baltic states, Romania, Bulgaria, Slovakia, and Slovenia in 2004; and others after — was a betrayal that threatened Russian security. Gorbachev himself said he was assured NATO would not expand.

The Western counterargument: Baker's remark was about East Germany specifically, not all of Eastern Europe. No formal treaty was signed. Gorbachev himself told the Brookings Institution in 2014 that 'the topic of NATO expansion was not discussed at all' during reunification talks. Moreover, sovereign nations have the right to choose their own alliances.

The scholarly middle ground: Historians like Mary Elise Sarotte have shown through declassified documents that Western leaders did give verbal assurances that went beyond East Germany, but these were never formalized in treaties. The truth is messier than either side admits.

The 2008 Bucharest Summit

The 2008 NATO summit in Bucharest was a pivotal moment. The US under George W. Bush pushed for Membership Action Plans (MAPs) for Ukraine and Georgia. France and Germany blocked it, fearing Russian retaliation. The compromise language — that Ukraine and Georgia 'will become members of NATO' without a concrete pathway — is widely seen as the worst possible outcome: it provoked Russia without actually protecting either country.

Russia invaded Georgia five months later. Many analysts see a direct line from Bucharest to the 2008 Russo-Georgian War, the 2014 annexation of Crimea, and the 2022 full-scale invasion — each a response to perceived Western encroachment into Russia's sphere of influence.