At least 10 people have been killed, and more than 50 wounded, following explosions on two train carriages at metro stations in the Russian city of St. Petersburg.
At least three Turkish soldiers have been accidentally killed, and a further 11 wounded, by Russian airstrikes against Islamic State in northern Syria.
Russia has announced that one of its attack helicopters has crashed, but was not shot down, in Syria, killing both pilots.
At least 26 Syrian soldiers have been reportedly killed, by Islamic State militants, west of the captured city of Palmyra.
At least five people have been killed, following a gas explosion and fire, at an apartment building, in southern Russia.
Turkish forces have shot down a Russian warplane, near the country’s border with Syria, claiming the jet had repeatedly violated Turkish airspace.
Tajikistan security forces have reportedly tracked down and killed a renegade ex-deputy defence minister.
At least two Ukrainian soldiers, and several civilians, have been killed, following fighting between Ukrainian forces and pro-Russian rebels, in restive eastern Ukraine.
Russian security forces have purportedly killed at least 14 suspected Islamist militants, eight of whom suspected of being members of the Islamic State, in the North Caucasus.
At least 23 soldiers have been killed, and a further 19 people pulled from the rubble, following the collapse of a military barracks, near the Siberian city of Omsk.