NATO leaders will agree next week to help modernize Ukraine’s armed forces, create a new high-level forum for consultations and reaffirm that it will join their alliance one day, the organization’s top civilian official said Friday. But the war-torn country will not start membership talks soon. At a two-day summit starting Tuesday in the Lithuanian capital, Vilnius, U.S. President Joe Biden and his counterparts will also agree to boost defense spending as allies pour weapons, ammunition and other support like uniforms and medical equipment into Ukraine, 17 months into the war.