In both Syria and Iraq, Islamic State (IS) is exposed to increasingly fierce air strikes.
Bombs are practically raining down on ISIS, reports TV2.
It may be the most powerful bombardment of the extremist movement to date, assesses the Syrian Observatory for Human Rights, which monitors the development in the war-torn country.
- It is the most violent bombardment since the uprising began in 2011, says the monitoring group's leader, Rami Abdel Rahman, to AFP.
Fighter jets struck against the province of Deir Ezzor, controlled by the Islamic State. In addition, Russian warships in the Caspian Sea fired cruise missiles against the area east of Syria.
Both large and small cities in the province are targets of the attacks. Also three oil fields have been taken out. Sale of oil is considered to be the main source of income for the Islamic State.
President Vladimir Putin vowed this week that Russia will hunt down and "punish" those who are to blame for a Russian charter flight in October crashed in Egypt.
All 224 people on the plane died. The Islamic State has claimed responsibility for the attack.
The effort in Syria is closely followed on Russian television. On Friday, a clip from the Russian air base in Syria showed a man with a black marker pen writing "For our people!" and "For Paris!" on the bombs in the minutes before the warplanes took off.
Russia's actions are independent of the US-led coalition, which since the autumn of 2014 has attacked the Islamic state from the air in both Syria and Iraq.
On Friday, the US military said, according to Reuters, that fighter jets from the coalition, on Thursday conducted 20 attacks against the Islamic State in Iraq.
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