Russian President Dmitry Medvedev  on Tuesday predicted decades of instability in the Arab world if protesters whom he called fanatics come to power, adding no such scenario will be permitted at home.

Medvedev's words fall in sharp contrast with the European Union, which said in a statement on Monday that it "deplores the violence" and "repression" against the pro-democracy protesters by authorities in one of the troublespots, Libya.

Speaking at a security meeting in the Caucasus city of Vladikavkaz, Medvedev didn't name countries, but he was referring to the crisis in the Middle East and North Africa — which has brought down governments in Tunisia and Egypt and sparked protests in Libya, Yemen, Bahrain, Iran, Morocco and Jordan.

"These states are difficult, and it is quite probable that hard times are ahead, including the arrival at power of fanatics. This will mean fires for decades and the spread of extremism," Medvedev said in televised comments.

Any attempts to repeat the unrest in Russia would be quashed, he said.