Russian President Vladimir Putin still believes his country has the resources and personnel necessary to wait out both Ukraine and the Western support it has enjoyed over the course of the war, according to a senior NATO official.

Russia’s troops initially sought to conquer Kyiv and were expected to do so in a matter of weeks, but they have adjusted their targets in the short term to focus on conquering land in the eastern part of Ukraine, where the fighting has been primarily for much of the conflict. The conflict has dragged on for two and a half years, and it could go on for several more years to ensure Russia doesn’t succeed.