Russian troops managed to break through Ukrainian defenses near the eastern town of Kreminna on February 21 but were pushed back and lost some of their heavy equipment, a senior Ukrainian official said the following day. Luhansk regional Governor Serhiy Hayday made his remarks in an interview with Ukrainian television. In earlier comments, he said the attack had been repulsed but made no mention of pro-Moscow forces breaching Ukrainian positions.
Source : Radio Free Europe Radio Liberty