The Ukrainian army is determined not to lose the administrative centre of Svererdonetsk to Russian troops despite days of fierce fighting. “The situation is difficult, but it is better than yesterday. And it is under control,” Olexiy Hromov, the deputy chief of the general staff, told journalists in Kiev. His comments came after the Ukrainian authorities said Russian troops had taken control of key parts of the besieged city in Luhansk. Hromov said there was very bloody street fighting in the city, seen as the last major Ukrainian stronghold in the region. The Russian military and separatist t…