Ukrainian forces have raised their national flag over a police station in the city of Luhansk which was for months under rebel control, Kiev said on Sunday, in what could be a breakthrough in Ukraine's efforts to crush pro-Moscow separatists.
Ukrainian officials said however the rebels were fighting a desperate rearguard action to hold on to Luhansk - which is their supply route into neighbouring Russia - and that the flow of weapons and fighters from Russia had accelerated.
The foreign ministers of Ukraine, Russia, France and Germany were meeting in Berlin and German Foreign Minister Frank-Walter Steinmeier said talks would focus on how to achieve a ceasefire and prevent weapons and fighters crossing into eastern Ukraine.
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Russia denies helping the rebels and accuses Kiev, backed by the West, of triggering a humanitarian crisis through indiscriminate use of force against Russian speakers in eastern Ukraine who reject the Ukrainian government's rule.
Andriy Lysenko, a Ukrainian military spokesman, said government forces fought separatists in Luhansk on Saturday and took control of the Zhovtneviy neighbourhood police station. "They raised the state flag over it," Lysenko said.
Separatist officials in Luhansk could not be reached by telephone, and a separatist spokeswoman in Donetsk, the other rebel stronghold, said she had no information about Luhansk.
A photograph posted on Twitter appeared to show a Ukrainian flag on the front of the police station, but it could not be independently verified. If confirmed, the taking of the police station is significant because Luhansk has for several months been a rebel redoubt where Kiev's writ has not run. Separatists still control sections of the border linking Luhansk region to Russia.
Ukrainian President Petro Poroshenko announced another military success, saying his forces had recaptured a railway junction at Yasynuvata, north of Donetsk, which he said had "strategic significance".