This is pro Ukrainian propaganda/news, I have found them be credible and the Ukrainians tend not to lie outright, they have the press with them and they are everywhere now. Besides, they don't need to lie about how bad Vlad and his troops are, the facts speak for themselves.
Seems they are infiltrating troops into Mariupol according to his, they can operate at night, the Russians generally can't. If they came, they must have brought ammo for the others and since they evacuated the wounded, they had transport of some kind. Those guys who went in had real big balls, they are gonna stay there too.
Ukrainian Forces BROKE THROUGH Russians to Join 'Azov Regiment'