Russian forces destroyed a large energy facility in Ukraine’s second-biggest city, Kharkiv, the mayor said on Thursday, the latest target of a winter air campaign by Moscow that has plunged millions of Ukrainians into darkness and cold. Kharkiv mayor Ihor Terekhov said on Telegram that emergency crews were working around the clock, while he did not specify what sort of facility had been hit. Regional governor Oleh Syniehubov said officials were assessing the extent of damage.

Volodymyr Zelenskyy proceeded with a drive to tackle the damage inflicted by Russian strikes, chairing a meeting aimed at securing quick decisions from regional leaders. The Ukrainian president said there had been new strikes on the capital into the evening. Kyiv mayor Vitali Klitschko said about 300 apartment buildings remained without heat after a 9 January attack knocked out heating to half the city’s high-rises.

The UK on Friday announced new emergency energy support of £20m ($27m) for Ukraine after Zelenskyy declared a state of emergency following sustained attacks on the country’s power infrastructure. He acted as emergency crews worked to restore heating and electricity in Kyiv and other cities after last week’s attacks by Russia knocked out supplies during sub-zero temperatures. The British support includes funding aimed at keeping electricity and heating on in homes, hospitals and schools across winter.