Brand new police were introduced in Kramatorsk and Sloviansk on May 15, 2016 / Photo from UNIAN

"The [law-enforcement] reform is being implemented step-by-step," he tweeted on Sunday, May 15.

In particular, patrol police will begin to work in the cities of Kryvyi Rih and Mariupol, as well as in the towns of Lysychansk, Rubizhne, and Severodonetsk.

Read alsoCabinet posts endorsement of Zguladze's resignationIn his words, the patrol police are now working in 27 Ukrainian cities and towns, including Kramatorsk and Sloviansk, where the brand new police were introduced on May 15 after they had taken the oath of allegiance to the Ukrainian people.

Read alsoUkraine's ex-cop reveals details of his participation in Crimea takeoverKramatorsk and Sloviansk were under Russian occupation in from April 12, 2014, to July 5, 2014.