Ukrainian President Volodymyr Zelenskyy says the war with Russia is in a new stage, with winter expected to complicate fighting after a summer counteroffensive that failed to produce desired results due to enduring shortages of weapons and ground forces.

Despite setbacks, however, he said Ukraine won’t give up.

“We have a new phase of war, and that is a fact,” Zelenskyy said in an exclusive interview Thursday with The Associated Press in Kharkiv in northeastern Ukraine after a morale-boosting tour of the region. “Winter as a whole is a new phase of war.”

Zelenskyy also said he fears the Israel-Hamas war threatens to overshadow the conflict in Ukraine, as competing political agendas and limited resources put the flow of Western military aid to Kyiv at risk.