Russia's National Anti-Terrorism Committee said it had arrested a group of people on Sunday who were preparing a terrorist attack in Moscow, TASS news agency reported.
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"At the flat where the bandits were hiding, an improvised explosive device was found and defused," TASS reported the committee as saying.
The announcement may be a ploy by the Kremlin to justify its aerial assault on Syria retroactively.
Russian warplanes pounded Syrian rebels unaffiliated with Islamic State on Sunday, insurgents said, helping Moscow's ally Bashar al-Assad reclaim territory and dealing a fresh setback to the strategy of Washington and its allies.
President Vladimir Putin - who has infuriated Assad's enemies in the United States, Europe, Turkey and the Arab world by bombing the rebels to protect him - reached out to one of the Syrian leader's fiercest opponents by meeting the powerful defense minister of Saudi Arabia.
The Syrian Observatory for Human Rights, a group that monitors the 4-year-old conflict, said the Syrian military and its Lebanese Hezbollah militia allies had taken control of Tal Skik, a highland area in Idlib province, after fierce Russian bombing.
That brings Syrian government forces closer to insurgent-held positions along the main highway that links Syria's principal cities. The area is held by a rebel alliance that excludes Islamic State fighters.
"The coming battles are going to be ferocious, the Russians are using scorched earth policy and they are hitting the targets very accurately but this is a battle of destiny," said Abu Hamed, the head of the military bureau of Jabhat Sham, an insurgent group that operates mainly in Hama province.
The Syrian army made advances from the towns of Mourek and Atshan in Hama province using tanks, heavy artillery and new surface-to-surface missiles, he said.
Russia said its planes had flown 64 sorties, striking 63 targets and destroying 53 fortified positions in the previous 24 hours. As in the past, it described all targets as belonging to Islamic State, although most of the areas it said it had struck are not held by that group.
Syrian state television also reported that the government had captured Tal Skik with the help of Russian air strikes.