Zelenskiy fears second Russian attack in Kharkiv

Ukrainian President Zelenskiy warns of Russia's increased offensive in the north-east, with only 25% of needed air defenses. Russian forces gained 278 sq km in Kharkiv region. Zelenskiy calls for 120-130 F-16 fighter jets for parity. Ukraine struggles with recruitment and rotation issues. Russia aims to stretch Ukrainian troops and resources. Putin claims the offensive is in retaliation for Ukraine's actions. Ukraine evacuates 10,000 people.