Commandoes were reportedly being deployed in Ajristan district of the central Ghazni province where dozens of militants were also killed as clashes continued close to government compound and police headquarters.
Ministry spokeswoman Maria Zakharova says those killed in Syria are not Russian service personnel.
Tension has been running high in Aden since the separatist Southern Transitional Council (STC) called for sacking the government of Prime Minister Ahmed bin Daghr. The STC has accused the government of pushing the country to the verge of famine.
The Democratic Unity coalition had called a march on the pro-Maduro Supreme Court in support of alternative magistrates appointed by the opposition, but security forces blocked their way with armoured cars and riot shields.
Muslims in the West Bank and Occupied East Jerusalem staged protests as Friday prayers were meant to start. They are opposed to Israel's installation of metal detectors at the Al Aqsa Mosque complex.
Two days of violence between herders and farmers erupted when some villagers fatally attacked a young Fulani herder on Sunday in Kajuru village, 50 kilometres (30 miles) outside the city of Kaduna.
Sheikh Ikrima Sabri, the imam of Al Aqsa Mosque was injured during clashes with Israeli police on Tuesday. Clashes at the compound that left two Israelis and three Palestinians dead last week have escalated tensions.
Tensions around Al Aqsa mosque escalates as Israeli police use stun grenades to disperse Muslims outside one of the entrance gates to Jerusalem's holy site.
Fighting between Ahrar al-Sham and the al-Qaida-linked Hayat Tahrir al Sham is the first serious act of violence since both sides reached a truce in February.
Eight people are reported to have died and at least 49 were seriously injured after a wall collapsed at Demba Diop stadium in Dakar.
Iraqi PM Haider al-Abadi announced victory against Daesh in Mosul on Monday, but the remaining militants are still holding out in their former stronghold in pockets of the Old City.
At least 23 people have been detained in a clash between the opposition and the security forces in a Los Verdes apartment complex on Wednesday in Venezuela. The raid to capture protesters was carried out after security forces came under fire.
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