A NIGHT-TIME Russian attack using Iranian-designed drones killed four people and wounded 12 in Kharkiv, Ukraine’s second-largest city, local authorities said today.

Shahed drones assailed two blocks of flats in the city near the Russian border that has frequently been targeted during more than two years of war.

The Kremlin’s forces in recent months have stepped up their aerial barrages of Ukraine, hitting urban areas and the power grid. The 620-mile front is largely deadlocked, but Kiev officials say they expect a large-scale Russian offensive in the summer.