Russian attack on Ukrainian children's hospital, more than 20 dead

Similarly, in the attack in the central Ukrainian city of Kryvyi Rih, 10 people were killed and 31 were injured, according to Oleksandr Vilkul, the head of the city administration.

This was the biggest bombing in Kiev in months . According to the Ukrainian Air Force, the Kinzhal hypersonic missile, one of Russia's most advanced weapons, was also used in the day-long attack.

Kinzhal flies at a high speed ie 10 times the speed of sound, so it is difficult to stop it . Buildings in the city were shaken due to the explosion.

Ukrainian President Volodymyr Zelensky said that Russia had fired more than 40 different types of missiles at apartment buildings and public structures.

The Kyiv city administration reported that in some areas debris from the missile fell and started to catch fire . A thick plume of smoke rose from many areas of Kiev .

The head of Ukraine's presidential office, Andriy Yermal, said the attack took place when many people were gathering on the streets of the city.

Kyiv Mayor Vitali Klitschko said an official assessment of the outcome of the attack is under way.

In the central Dnipropetrovsk region of Ukraine, local authorities also reported an explosion.

The attack came on the eve of a three-day NATO summit in Washington aimed at reassuring Ukraine of the alliance's unwavering support and raising hopes of how Ukraine can get through Europe's biggest conflict since World War II.