KYIV, Ukraine (AP) — Russia launched its biggest drone attack against Ukraine overnight, a Ukrainian official said Monday, part of an escalating bombing campaign that has further dashed hopes for a breakthrough in efforts to end the 3-year-old war.

On the third straight night of significant aerial bombardments, U.S. President Donald Trump lashed out at Russian leader Vladimir Putin, saying he had gone “crazy” by stepping up attacks on Ukraine.

The expansion of Russia’s air campaign appeared to be another setback U.S.-led peace efforts, as Putin looks determined to capture more Ukrainian territory and inflict more damage. It comes after Kyiv accepted an unconditional 30-day ceasefire in March that was proposed by the U.S. but that Moscow effectively rejected.

This month alone, Russia has broken its record for aerial bombardments of Ukraine three times.