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(Image: TWITTER/GETTY)

Unverified images appeared showing aircraft similar to Russian Yakovlev jets above the war-torn nation – sparking speculation Russia was about to carry out airstrikes against ISIS targets.

It came after the jihadist regime claimed it carried out a deadly car bomb attack on a Russian military headquarters in Dagestan.

But the Kremlin has dismissed reports the jets were participating in strikes against ISIS.

Kremlin spokesman Dmitry Peskov said "one shouldn't believe these reports" when quizzed over the photos.

The White House said it is "closely monitoring" reports of Russian aircraft above Syria.

White House spokesman Josh Earnest said: "We are aware of reports that Russia may have deployed military personnel and aircraft to Syria, and we are monitoring those reports quite closely.

"Any military support to the Assad regime for any purpose, whether it's in the form of military personnel, aircraft supplies, weapons, or funding, is both destabilizing and counterproductive."

Earlier this week Israeli media claimed Russia was bringing "expeditionary force" to Syria to set up a camp at a government airbase near the Syrian capital Damascus.

But Russian sources have shot down talk of jets and drones arriving in Syria.

(Image: GETTY)

The terrorist group claimed responsibility a reported attack on the Russian military headquarters on Wednesday (September 2).

Brutes are claimed to have driven a car into the building before detonating a bomb.

It is alleged ISIS carried out the attack in revenge for Russian troops entering Damascus to fight anti-Assad militants in Syria.

It would also be the first claimed ISIS attack in the Caucuses region.

An Egyptian affiliate of ISIS – Wiliyat Sunai – released a video this week purportedly showing its military strength in the country.