In 1999, Poland joined the NATO Alliance. Ever since, collective defense has been at the heart of Poland’s national security strategy. But recent changes in Europe’s strategic environment may be leading Poland to think twice about whether collective defense alone can guarantee its security. The combination of a more aggressive Russia, a less resolute Western Europe, and a growing divergence between the military capabilities of Poland and those of the rest of NATO have made unilateral Polish action a real possibility.
In late 2014, Swedish authorities spotted what many suspected was a Russian submarine lurking off Stockholm. The incident set off alarm bells among Swedes. It reminded them of a similar incident in 1981, when a nuclear-armed Soviet Whiskey-class submarine ran aground a few kilometers outside Sweden’s main naval base. Following Russia’s invasion of Georgia, annexation of Crimea, and intervention in eastern Ukraine, the recent submarine scare served to underline the threat that a resurgent Russia could pose to Sweden.
Sweden is not a member of NATO. But Sweden is very important to the defense of NATO’s Baltic member countries of Estonia, Latvia, and Lithuania. That importance mainly stems not from what Sweden could add to NATO’s collective military strength, but from how its strategic position could help NATO overcome the operational challenges it would face if it needed to respond to a Russian invasion of the Baltics.
NATO seems more united today than it has been at any time since the end of the Cold War. An aggressive Russia, unbowed by Western economic sanctions after its annexation of Crimea and intervention in eastern Ukraine, has driven NATO member countries closer together. However, if given the opportunity, an aggressive Russia could also put NATO in a position that could strain its cohesion and ultimately undermine its existence. One place where that could happen is in the Baltics states of Estonia, Lithuania, and Latvia.
As NATO expanded eastwards after the Cold War, the geography that the Alliance needed to defend changed significantly (See map). Rather than a relatively narrow front in Central Europe (dashed line), NATO now had to contend with a far wider front across Eastern Europe (solid line) stretching its defense capabilities. When the Baltic countries of Estonia, Latvia, and Lithuania joined the Alliance in 2004, they created an even greater operational challenge for NATO.