Kyiv will impose a 36-hour curfew from Tuesday night amid a "difficult and dangerous moment" after several strikes hit the city, AFP reported citing Mayor Vitali Klitschko.

"Today is a difficult and dangerous moment," former boxing champion Klitschko said in a statement on Telegram.

"This is why I ask all Kyivites to get prepared to stay at home for two days, or if the sirens go off, in the shelters."

The curfew will start at 8pm (1800 GMT) on Tuesday until 7pm (1700 GMT) on Thursday.

It comes as the Polish, Czech and Slovenian prime ministers were traveling to Kyiv by train on Tuesday in the first visit by foreign leaders to the capital.

"Movement around Kyiv without special permits is forbidden. It is only allowed to go outside with the aim to get to the shelters," he added.

Kyiv imposed a similar curfew on Feb. 26.