Both the flight data and voice recorders failed 24 minutes after the plane took off from Egypt's Sharm el-Sheikh resort en route to Saint Petersburg on October 31, when it plummeted from the sky into the Sinai Peninsula killing all 224 people on board.
Cairo and Moscow initially dismissed a claim Islamic State (IS) jihadists downed the plane, but mounting evidence that the Airbus A321 was attacked has prompted a growing list of governments to warn against travel to Sharm el-Sheikh.
Kremlin spokesman Dmitry Peskov told news agencies the measure did not mean Moscow believed the crash - the worst aviation disaster in Russia's history - was due to an attack, and the investigation continued.
The head of Russia's emergencies ministry said Russian experts had taken samples from the crashed jet and were testing it for any traces of explosives.
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But a source close to the investigation told AFP the black box data "strongly favours" the theory a bomb on board brought down the plane.
Egypt's Civil Aviation Minister Hossam Kamal and the head of the Egyptian-led investigation into the disaster are to hold a news conference, the ministry confirmed.
Egyptian President Abdel Fattah al-Sisi's office said he called Putin and they agreed to bolster coordination to "strengthen security measures for Russian planes".
Nearly 80,000 Russian tourists are estimated have been stranded in Egypt by their government's decision to halt flights.
Britain yesterday lifted its block on flights out of Sharm el-Sheikh but just 1,200 of the estimated 20,000 Britons who were holidaying in the resort managed to get home.
Those that did get out were forced to leave their check- in baggage behind to be transported separately after London ordered airlines to allow hand luggage only.
Egypt's aviation minister said the restrictions on flights were imposed because the airport could not cope with all the luggage left behind.