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A woman reacts in front of her house destroyed as a result of shelling between Ukrainian forces and pro-Russian separatists on August 10, 2015 in Golmovsky village, Donetsk region. Ukraine on Monday reported repelling a rare tank assault by pro-Russian rebels that threatened to usher in a dangerous escalation to the 16-month war. President Petro Poroshenko said about '200 insurgents used tanks to storm' Novolaspa -- a village half-way between the separatists' de facto capital Donetsk and the Kiev-held port of Mariupol -- in a pre-dawn raid that caught government soldiers off guard. AFP PHOTO / ALEKSEY FILIPPOV (Photo credit should read ALEKSEY FILIPPOV/AFP/Getty Images)

A woman reacts in front of her house destroyed as a result of shelling between Ukrainian forces and pro-Russian separatists on August 10, 2015 in Golmovsky village, Donetsk region. Ukraine on Monday reported repelling a rare tank assault by pro-Russian rebels that threatened to usher in a dangerous escalation to the 16-month war. President Petro Poroshenko said about '200 insurgents used tanks to storm' Novolaspa -- a village half-way between the separatists' de facto capital Donetsk and the Kiev-held port of Mariupol -- in a pre-dawn raid that caught government soldiers off guard. AFP PHOTO / ALEKSEY FILIPPOV        (Photo credit should read ALEKSEY FILIPPOV/AFP/Getty Images)