Ukrainian President Petro Poroshenko has cancelled a visit to Turkey, citing "Russian troop deployments" in the east of the country, reports GHN based on BBC.
Mr Poroshenko said his place was in Kiev in view of a sharp deterioration in the situation in Donetsk region.
His announcement came as pro-Russian rebels captured the seaside town of Novoazovsk and threatened to take the strategic port city of Mariupol.
The rebel successes constitute the opening of a new front in the conflict.
