Spectacular footage has shown the precise moment a Ukrainian drone apparently smashes into a Russian oil refinery more than 200 miles behind enemy lines.

       A day after yesterday’s Russian horrific missile attacks on targets across Ukraine, Kyiv appeared to hit back in footage shared on the Ukraine-based Telegram app SHOT.

       The projectile is shown homing in on the refinery before there is a loud explosion.

       The camera then pans back to show thick smoke billowing high into the sky.

       An accompanying post says: “The Ukrainian Armed Forces attacked the town of Kalach-on-Don in the Volgograd region. Initially, the target of enemy drones was a local oil depot.

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       “According to SHOT, explosions began to rumble in the city around 4 am, local residents counted about 10 pieces.

       “After that, a fire started in the area of ？？the oil depot, a black column of smoke is now visible from different areas of the city.

       “There was no official information and data about the victims yet.”

       Russian missiles blasted cities across Ukraine on Monday, damaging the Okhmatdyt Children's Hospital in Kyiv and other buildings in a fierce assault that interrupted heart surgeries and forced young cancer patients to take their treatments outdoors.

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       At least 31 people were killed, officials said.

       The daytime barrage targeted five Ukrainian cities with more than 40 missiles of different types, President Volodymyr Zelenskyy said on social media.

       Ukraine's air force said it intercepted 30 missiles. More than 150 people were wounded.

       Mr Zelensky said: "It is very important that the world should not be silent about it now and that everyone should see what Russia is and what it is doing.”

       Russia denied attacking the hospital, insisting the strikes hit military targets.