(Reuters) – Russia has ordered its forces in Ukraine to step up operations, its defence ministry said, as rockets and missiles pounded the country in the latest of a series of bombardments that Kyiv says have killed dozens of people in recent days. FIGHTING * Two people were killed in Nikopol when heavy Russian rocket attacks hit the southern Ukrainian town, the emergency services and regional governor said. * Russian Defence Minister Sergei Shoigu has ordered Russian military units operating in all areas of Ukraine to step up their operations in order to prevent strikes on eastern Ukraine and…