KYIV, Ukraine

Ukraine announced Thursday that it will impose a curfew in some cities, including the capital, Kyiv.

The curfew from 10 p.m. to 6 a.m. will be imposed in Cherkasy, Dnipro and Mykolaiv, the Ukrainian Center for Strategic Communications said in a statement.

Public transportation will not operate during the curfew but metro stations will be open to be used as shelters, it added.

Donbas crisis and Russia's military intervention

Ukraine’s February 2014 “Maidan revolution” led to President Viktor Yanukovych fleeing the country and a pro-Western government coming to power.

Russia then illegally annexed Crimea, and separatists declared “independence” in the Donetsk and Luhansk regions of Donbas in eastern Ukraine, both of which have large ethnic Russian populations.

Clashes took place between Russian-backed separatist forces and the Ukrainian army. The 2014 and 2015 Minsk agreements, signed in Moscow with the intervention of Western powers, tried to stop the conflict but cease-fire violations continued and as of February, 14,000 people had lost their lives in the conflict.

Late last year, Russia made headlines with the deployments of tens of thousands of troops on the border with Ukraine.

The US said Russia was preparing for an invasion, but Moscow denied it. Despite the threat of Western sanctions, Moscow recognized the two regions as 'independent' on Monday, Feb. 21 and started a military intervention Feb. 24 into Ukrainian territory.

Russian President Vladimir Putin said the operation aims to protect people “subjected to genocide” by Kyiv and to “demilitarize and denazify” Ukraine. He called on the Ukrainian army to lay down its arms.​​​​​​​​​​​​​​