Russia and Ukraine failed to agree on a range of critical issues when they held peace talks in the spring of 2022. Documents from those talks obtained by The New York Times shed new light on what those issues were — and what are likely to be the main sticking points in any future negotiations to end Europe’s biggest land war in generations.

President Vladimir Putin of Russia has repeatedly referred to the 2022 talks as a foundation for any future deal, though many Ukrainian and Western officials doubt that Russia would be willing to settle for anything less than the full subjugation of Ukraine.

Ukraine’s efforts to join NATO were at the core of Putin’s justifications for invading the country in February 2022.