Xinhua file photos of Russian Foreign Minister Sergei Lavrov (R) and Turkish Foreign Minister Mevlut Cavusoglu

Lavrov and Cavusoglu expressed deep concern about the possible serious consequences of the U.S. action for peace and stability in the Middle East region.

Russian Foreign Minister Sergei Lavrov and his Turkish counterpart, Mevlut Cavusoglu, voiced concerns on Saturday over the killing of Iranian Major General Qassem Soleimani in a U.S. airstrike.

During a phone conversation, Lavrov and Cavusoglu expressed deep concern about the possible serious consequences of the U.S. action for peace and stability in the Middle East region, the Russian Foreign Ministry said in a statement.

"Sergei Lavrov emphasized that U.S. actions are a gross violation of fundamental norms of international law and do not contribute to the achievement of the goals of the fight against terrorism declared by Washington," the statement said.

Soleimani, commander of Iran's Islamic Revolution Guards Corps Quds Force, was killed in the U.S. airstrike near Baghdad International Airport.

Iran's top leader Ayatollah Ali Khamenei has vowed "tough revenge" for the deadly attack.