Istanbul (dpa) - In northern Syria, according to activists, there have again come to heavy fighting between Kurdish militia and rebels allied with Turkey. In addition, the Turkish Air Force bombed the area, said the Syrian Observatory for Human Rights. Notwithstanding the fighting, the presidents of Turkey and Russia, Recep Tayyip Erdogan and Vladimir Putin, reiterated that they wanted to stick to a ceasefire agreed in October. This was reported by the official Turkish news agency Anadolu following a telephone conversation between the two politicians.