Kyiv has come under heavy bombardment in what independent monitors say is one of the biggest Russian attacks on the Ukrainian capital since Moscow launched its full-scale war more than three-and-a-half years ago.

Drones flew over the city and surrounding region and anti-aircraft fire rang out through Saturday night, with the attack continuing as of 7.20am on Sunday (2.20pm AEST).

Some residents fled to metro stations deep underground for safety. Many regions across the country were under air raid alert.

Meanwhile, Poland has closed its airspace near its southeastern cities of Lublin and Rzeszow due to “unplanned military activity related to ensuring state security”, flight tracking service Flightradar24 says.

The Polish armed forces said it scrambled aircraft to ensure the securi

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