Ukrainian fighter jets have bombarded separatists along a broad front, inflicting large losses, the government says, after President Petro Poroshenko pledged "scores and hundreds" would be made to pay for a deadly missile attack on Ukrainian forces.

Andriy Lysenko, a spokesman for Ukraine's "anti-terrorist operation", said there had been 16 flyovers by Ukrainian fighter jets in all.

Al jazeera's Scott Heidler reports.

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