@Walter Hinteler,
The only positive news seems to be that the OSCE observers held by pro-Russian separatists in eastern Ukraine have been released in the town of Slovyansk. (Russia's RIA news agency quoted Putin's envoy as saying.)
Dozens of people were killed in a fire and others were shot dead when fighting between pro- and anti-Russian groups broke out on the streets of Odessa on Ukraine's Black Sea coast on Friday, opening a new front in a conflict that has split the country. (Ukrainian police just watch the pro-Russians die in the fire.)
In the east, pro-Russian separatists brought down two Ukrainian military helicopters.
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