Russia fired missiles at several cities in Ukraine in the early hours of Monday, with air alerts sounding in many parts of the country.
Explosions were heard in the capital Kyiv, the north-eastern city of Kharkiv, and the south-eastern city of Zaporizhzhya.
Ukrainian authorities, however, called on people to seek safety in shelters.
It has been 250 days since the start of Russia’s invasion of Ukraine.
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Russia has declared that it is targeting the neighbouring country’s energy infrastructure in particular.
Ukraine says Moscow’s intention is to plunge people into darkness, cold, and fear, thus driving them to flee to the European Union.
“We will persevere. This disgrace will cost whole generations of Russians dearly,” the head of Ukraine’s presidential office, Andriy Yermak, said on Telegram.
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