At least six people died in clashes between government forces and Russia-backed separatists in eastern Ukraine, officials said on October 28.
The surge of deaths in the two-year conflict came 10 days after German Chancellor Angela Merkel and French President Francois Hollande tried to breathe life into a stalled peace process during talks with Russia's Vladimir Putin and Ukrainian President Petro Poroshenko in Berlin.
"Over the past 24 hours, as a result of fighting, one Ukrainian serviceman was killed," Kyiv's military spokesman Andriy Lysenko told reporters, accusing the separatists of "a sharp intensification" of attacks.
The separatists' news agency said at least two of their fighters were killed and another six wounded on October 27.
The TASS news agency reported that four separatist fighters were killed and nine wounded.
The separatists also reported the death of three civilians and the wounding of 18 others by Ukrainian shelling near Donetsk.
The Berlin summit failed to resolve one of Europe's bloodiest conflicts since the Balkans wars of the 1990s, with the leaders only agreeing to come up with a "road map" for peace by the end of next month.
The fighting has claimed over 9,600 lives since the conflict began in 2014.