Israel for the first time admitted that it bombed a suspected Syrian nuclear reactor in 2007 and said on Wednesday the strike should be a warning to Iran.
About 300 men working for a Kremlin-linked Russian private military firm were either killed or injured in Syria last week.
Six Russian long-range bombers struck Islamic State targets in Syria's Deir al-Zor province.
Russia's Defence Ministry denied on Monday that Russian war planes had carried out deadly air strikes on a village in Syria's Deir al-Zor province.
A suicide car bomb exploded on Saturday in Syria's eastern city of Deir al-Zor, killing and injuring dozens.
Islamic State's self-proclaimed caliphate was all but reduced on Friday to a pair of border towns at the Iraq-Syria frontier.
Islamic State has been completely ousted from Syria's biggest eastern city, Deir al-Zor, Syrian state television reported on Friday.
The Syrian army and its allies took full control of Deir al-Zor city in eastern Syria from Islamic State.
Egypt Today briefs top European newspapers on Tuesday for political issues and others related to accidents.
Islamic State killed more than 60 civilians and left 100 others missing in a town in Syria's central Homs province over three weeks before the Syrian army recaptured.
Two Russian submarines fired 10 "Kalibr" cruise missiles from the Mediterranean Sea at militant targets in Syria's Deir al-Zor to support a Syrian army.
Russia's Defence Ministry said on Sunday that one its general lieutenants, Valeryi Asapov, was killed by mortar shelling in Syria.
The Russian Defence Ministry on Sunday denied it had bombed U.S.-backed militias in Syria.
The Russian Navy on Thursday fired seven cruise missiles at Islamic state targets in the suburbs of Syria's Deir al-Zor
The Syrian army linked up on Tuesday with troops that Islamic State had encircled for years in the eastern city of Deir al-Zor
Syrian government forces and their allies advanced against Islamic State militants in countryside east of Raqqa on Thursday.