Russian forces launched early-morning strikes across Ukraine on Monday, killing two people in the Kyiv region, authorities said, as air-raid sirens sounded nationwide on the eve of a diplomatic summit in France.

In the capital, a private medical facility caught fire as a result of the Russian strikes, killing one person and wounding three others, the State Emergency Service of Kyiv said. It released images of rescuers removing people on stretchers from a gutted building.

Another pre-dawn attack on the neighboring city of Fastiv killed one man in his 70s, according to Kyiv regional Gov. Mykola Kalashnyk.

The strikes caused power outages in the area, with backup systems activated to maintain water and heating supplies, the official said, as temperatures dropped to minus 8 degrees Celsius (17.6 degrees Fahrenheit).

The attacks came on the eve of a meeting of European leaders in Paris as they seek a breakthrough on a peace plan Kyiv says is "90%" ready.