The unconditional stance reflected a new confidence in Kiev that it was on the verge of quashing a rebellion it views as Moscow's retribution for the February ouster of a Kremlin-backed leader and the decision to pursue a historic alliance with the West.
But it was also bound to both frustrate EU leaders pushing for a diplomatic solution to the continent's worst crisis in decades, and Kremlin efforts to force Kiev to make compromises that would preserve the Russian-speaking east's ties to Moscow.
Ukrainian forces have scored a string of surprise military successes since the weekend that forced most of the militias to retreat to the sprawling eastern industrial hubs of Donetsk and Lugansk -- both capitals of their own "People's Republics".
President Petro Poroshenko has ordered his troops to blockade the insurgents inside the cities and cut them off from any further arms supplies.
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But it was not immediately clear how the new pro-Western leader intended to force the militias to give up their three-month campaign to join Russian rule.
Poroshenko cancelled a 10-day ceasefire on July 1 because of uninterrupted rebel attacks that claimed the lives of more than 20 Ukrainian troops.
German Foreign Minister Frank-Walter Steinmeier said yesterday that "even if the situation in eastern Ukraine has shifted in favour of the Ukrainian security forces, there will be no purely military resolution of the conflict".
But a round of indirect talks about a ceasefire brokered by the Organisation for Security and Cooperation in Europe (OSCE) in Kiev on Sunday produced no tangible result.