Putin did not specify who might pose a threat to Russia's stability. But in the past, he has often blamed Western security services of trying to destabilize the country using opposition groups and non-governmental organizations as their instruments.
"Any attempts to weaken or destabilize Russia, harm the interests of the country will be toughly suppressed," they quoted ex-KGB spy Putin as telling an annual meeting of top spies and security officers ahead of their professional holiday.
But what do you expect from a country which has a national holiday for the secret police?
The Day of Security Officers is marked annually on December 20, a day when in 1917 Bolshevik rulers created the CheKa secret police to suppress their foes. After a string of transformations, the Cheka became the KGB.
As president, Putin always personally attended the holiday meetings of security officials. Medvedev, a former corporate lawyer with no security background, stayed away and sent his chief of staff Sergei Naryshkin to deliver his greetings.