Russia was able to destroy a key power plant serving Kyiv because Ukraine ran out of defensive missiles, President Volodymyr Zelenskyy has claimed.

Speaking to US news outlet PBS on Tuesday, Zelenskyy’s comments follow repeated warnings from his government to its allies about scarce air defenses. Ukraine is desperately calling for ammunition as Russia scales up strikes on its infrastructure.

The Trypilska thermal power plant (TTPP), one of the biggest electricity suppliers to the Kyiv region, was destroyed by Russian missiles on April 11.

“There were 11 missiles flying. We destroyed the first seven, and [the remaining] four destroyed Trypillia,” he said, referring to the village in which the power plant is situated. ‘Why? Because there were zero missiles. We ran out of missiles to defend Trypillia.”