Turkey has stepped up its pressure on neighbouring Syria over the crackdown on protests by the Damascus government.
Turkish PM Recep Tayyip Erdogan said the future could not be built on "the blood of the oppressed", and condemned attacks on Turkish missions in Syria.
Meanwhile, Turkey's energy minister announced that joint oil exploration projects with Syria had been halted.
Damascus is also facing increasing pressure from the Arab League, which has suspended its membership.
bbc