Fighting has been reported in eastern Ukraine ahead of a meeting in Berlin to discuss a peace agreement reached some two months ago.
Four separatist fighters were injured in Monday's fighting with government troops around Donetsk airport and the region east of the port city of Mariupol, separatist spokesman Eduard Basurin said.
The Ukrainian Security Council said one soldier was killed and six were injured during the past 24 hours.
Speaking in Kiev, Council spokesman Oleksandr Motuzyanyk accused the pro-Russian separatists of violating the ceasefire by attacking government positions with heavy artillery.
The separatists carried out more than 20 attacks with large calibre weapons and tanks, Motuzyanyk said according to an official transcript.
Basurin accused the Ukrainian military of violating the ceasefire with "provocative attacks."
The Organisation for Security and Co-operation in Europe (OSCE), which monitors the ceasefire, expressed dismay at the violence.
The organisation's chief monitor in Ukraine, Ertugrul Apakan, called upon all sides to exercise restraint.
The fresh violence comes hours before the foreign ministers of Russia, Ukraine, France and Germany are to discuss the situation at a meeting in Berlin.
Martin Schaefer, a spokesman for German Foreign Minister Frank-Walter Steinmeier, said both sides were to blame for the violence.
He added the main issue at Monday's talks will be the political aspects of the peace agreement signed in February in Minsk.
The talks are set to begin 0400 AEST Tuesday.
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