The United Kingdom founded Syrian Station for Human Rights observing group believed the assaults had been supported out by Islamic National troops and that thirty five professional government fighters were murdered, counting 9 Russians.
As well as holding pockets of IS fighters, Deir al-Zour province also marks a division between areas held by Syrian government forces and Syrian Kurdish units, including the US-backed Syrian Democratic Forces.
The fighting erupted after several groups of rebels attacked an artillery battery of the Syrian army, the Russian Defence Ministry said.
The Russian government says only four of its citizens were killed in the battle, but other reports suggest dozens died. All 26 Syrians killed were claimed to be Syrian military forces according to the statement. During the battle with terrorists, which lasted about one hour, servicement eliminated 43 terrorists and six all-terrain vehicle with installed large caliber weapons.
"IS is trying to take the initiative and show it can still threaten the regime and its allies despite the losses it suffered in other areas", said Abdel Rahman.
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The Russian ministry said that the dead were military advisers attached to a Syrian army unit in the Deir el-Zour.
Two of them, who were serving as "military advisers" to the Syrian army, were killed on the spot, while two more died shortly afterwards while being treated at a Russian military hospital, the statement said.
More than 350,000 people have been killed and millions displaced since the civil war began in 2011 with the brutal repression of anti-government protests.
Several mobile groups of terrorists have attacked a Syrian government's artillery battalion.
Terrorists attacked Syrian and Russian troops, and the latter was forced to respond, according to the MoD.