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Kiev's pro-Western leaders and mediators hoped to reach a "binding" truce with pro-Russian separatists Saturday despite Ukraine suffering one of its bloodiest days yet in the nine-month conflict with 15 troops killed. The death toll is the highest one-day loss for Ukraine's military since the signing in September of a nominal ceasefire deal that has collapsed totally in recent weeks. With the civilian death toll also mounting in rebel regions Donetsk and Lugansk, the truce in addition should provide for the "unrestricted supply of basic goods and humanitarian assistance", the OSCE said. Separatist negotiators flew into Minsk on Saturday, as did Kiev's envoy, former president Leonid Kuchma, for the latest talks aimed at defusing fighting that has left at least 5,100 people dead.