In a country torn between Russia and western Europe, Ukrainian President Petro Poroshenko's decision to resume an offensive against pro-Moscow rebels has carefully ignored both neighbors to show an ear acutely tuned to Ukrainian domestic politics.

Telephone diplomacy involving the leaders of Germany, France and Russia, as well as Ukraine, has dwelt on extending a truce that could help ease tensions between Moscow and the West.

But in the end, in calling off a patchy 10-day cease-fire a week ago, Poroshenko may have been as influenced by more radical views within Ukraine. They are summed up in the voice of a young man who made his name in the street protests that toppled his predecessor and who is now fighting in the east.