Russia launched over 900 drones at Ukraine over the weekend and comes after U.S.-led efforts last week to reach a ceasefire between the two countries.

Ukraine said Russia launched more than 350 explosive drones and at least nine cruise missiles, hours after President Trump called Vladimir Putin “crazy.”

The expanded Russian aerial offensive signals another blow to US-led attempts to broker peace, as Russian President Vladimir Putin appears determined to seize more Ukrainian territory and inflict greater damage.