Ukrainian troops begin military operation to 'destroy foreign invader'
Kiev confirms deployment of troops outside Slavyansk in effort to wrest control of city from pro-Russian elements
Ukrainian army troops receive munitions on the outskirts of Izyum. Photograph: Sergei Grits/AP
Alec Luhn in Slavyansk and agencies
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Ukrainian military and special forces gathered outside Slavyansk on Tuesday in the first real show of force since Kiev announced an "anti-terrorist" operation at the weekend aimed at wresting the city from armed protesters and unmarked soldiers reported to be Russian.