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.”

“Look, we are not backing down, I am satisfied. We are fighting with the second (best) army in the world, I am satisfied,” he said, referring to the Russian military. But he added: “We are losing people, I’m not satisfied. We didn’t get all the weapons we wanted, I can’t be satisfied, but I also can’t complain too much.”