Ukrainian President Volodymyr Zelensky said on Sunday that the military cooperation between Russia and North Korea marks a new escalation in Moscow’s war of aggression against Ukraine. “We must respond and counteract. We must not allow evil to increase further,” Zelensky said in his evening video message. “If the world remains silent now and we are confronted with North Korean soldiers on the front line just as regularly as we defend ourselves against drones, this will not benefit anyone in the world and will only prolong this war.” Moscow has for days been denying reports from South Korea and…