Russia says it has launched rocket strikes on Islamic State group targets in Syria from warships in the Caspian Sea – about 1,500km (930 miles) away.
Defence Minister Sergei Shoigu said four warships fired 26 sea-based cruise missiles at 11 targets, destroying them and causing no civilian casualties.
Meanwhile, Syrian ground troops have launched an offensive under Russian air cover, Syrian officials say.
Russia denies claims that its week of strikes have mainly hit non-IS targets.
The Syrian Observatory for Human Rights reported “the most intense fighting in months” in Hama and Idlib provinces. The clashes followed a wave of Russian air strikes in the same areas, it said.
It appears to be the first co-ordinated offensive since the air campaign by Russia – a staunch ally of Syrian President Bashar al-Assad – began on 30 September.
Russia says it is targeting “all terrorists”, but at least some of its air strikes have reportedly hit civilians and Western-backed rebels.
In a separate development, Russia’s foreign ministry has said Moscow is willing to establish contact with a Western-backed rebel group, the Free Syrian Army, to discuss fighting IS and other terrorist groups, and “preparing the ground for a political settlement in Syria”.
US Defence Secretary Ash Carter said that coalition forces fighting IS in Syria would not co-operate with Russia.
