Washington says it has photographic proof showing that Moscow sent fighter jets to Libya to bolster warlord Haftar's ranks.
Russia's defence ministry said at least 14 sailors were killed by toxic fumes from the blaze on a naval research submersible but did not specify how many crew members were aboard.
Turkey's Defence Minister Hulusi Akar and his Russian counterpart Sergey Shoigu agree on intelligence and military cooperation in restive Idlib to ensure peace in the region.
Russia is holding live missile drills and flight missions in the Norwegian and Barents seas at a time when NATO is conducting its largest drill in the region since Cold War.
Russian defence minister Sergei Shoigu says Moscow has delivered four S-300 launchers along with radars and support vehicles to Syria and that it will take three months to train Syrian personnel to operate the system.
In a TRT World exclusive, a retired Syrian general, now part of the opposition, tells us about the Syrian army's "humiliating" defeat at the hands of the Israeli Air Force and how the S-300 might ensure that never happens again.
Syrian regime missile defence systems last week shot down a Russian military plane, killing all 15 people on board.
The Britain-based Syrian Observatory for Human Rights said 18 of 23 civilians killed in the Damascus suburb on Wednesday were victims of Russian air strikes.
The Mi-24 military helicopter was flying to Hama, northwestern Syria and there was no firing from the ground, agencies quote the Russian defence ministry as saying.
Russia says its military will stay for good in the strategic ports of Tartus and Khmeimim in Syria.
President Vladimir Putin has ordered the withdrawal of a significant part of Russia's military in Syria, after saying the problem of Daesh in Syria has been solved "spectacularly."
Qatari and Russian defence ministers discuss the Gulf and Syrian crises as well as “combating terrorism and violent extremism.”
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