Secretary General of NATO Jens Stoltenberg (L) and President Volodymyr Zelenskyy (R) during a meeting on April 20, 2023 in Kyiv, Ukraine.Photo by Andriy Zhyhaylo/Obozrevatel/Global Images Ukraine via Getty Images NATO members agree that Ukraine will join one day, the military alliance's chief said. Jens Stoltenberg said multiple times this week Ukraine's future is in the "Euro-Atlantic family." Ukraine has long sought NATO membership, something Vladimir Putin deeply opposes.