Russian President Vladimir Putin has said the killing of the Russian ambassador to Ankara is designed to spoil Russo-Turkish ties.
Mr Putin said the killing of Andrey Karlov in the Turksih capital was also intended to derail the Syria peace process.
He said Russian investigators have opened a criminal case into the killing.
Russia wants to know who directed the killer’s hand, he added and vow step up fight against terrorism.
The Russian president ordered security at Russian embassies around the world to be stepped up, and said he wants guarantees from Turkey about the safety of Russian diplomats.