Asapov is the highest-ranking Russian military officer to be killed in Syria.
Lieutenant-General Valery Asapov was killed in Syria, when Islamic State militants (the terrorist organisation is banned in Russia) attacked Russian and Syrian troops.
His death was "the price paid in blood" for USA hypocrisy, Russia's deputy foreign minister said.
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The SDF, bolstered by USA airstrikes and Special Operations forces, has advanced on Deir al-Zour from the north. The US-backed militia said over the weekend that they had come under attack from Russian jets and Syrian government forces, something Moscow denied.
Earlier in September the Syrian armed forces, working closely with the Russian Air Force, successfully broke the Daesh siege of Deir ez-Zor, and residents' lives have begun to return to some semblance of normality.
The main U.S-backed Syrian force fighting the Islamic State group says a Russian airstrike on a gas field it recently captured from the extremists killed one of its fighters.
Lieutenant-General Asapov was staying at the command post of Syrian troops to help Syrian commanders in a military operation to liberate Deir ez-Zor.
Some 100 countries expected to sign treaty banning nuclear weapons
The UN secretary general was hopeful that the document would help bolster global efforts to eliminate weapons of mass destruction. French Foreign Minister Jean-Yves Le Drian has called the treaty "wishful thinking" that is "close to irresponsible".
Human Rights Watch said Monday the attack raises concerns that the USA -led coalition fighting the Islamic State group did not take "adequate precautions to minimize civilian casualties".
In Deir al-Zor, the Islamic militants are battling two separate offensives, launched by the SDF on one side and the Syrian army and its allies on the other. "Despite the United States strongholds being located in the Isis areas, no screening patrol has been organised at them".
The convergence of the two rival offensives has increased tensions in Deir al-Zor.
But he was "mortally wounded" after a mortar strike was carried out by ISIS on Sunday.
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A firefighter and a rescuer search for survivors in Mexico City after a strong quake hit central Mexico on September 20, 2017. While another 30 children are believed missing, volunteer rescue crews discovered a girl inside the rubble Wednesday morning.
"We will not stand by with our arms crossed and we will use our legitimate right to self-defense".