It's now conventional wisdom that Moscow faces a brutal Islamic terrorist movement, bent on jihad, unwilling to compromise and determined to inflict pain on Russians almost as an end in itself. That's the view presented by Russian officials and accepted by Western leaders ... This unthinking acceptance of the Russian narrative allowed Moscow to respond with brutal violence, often against innocent civilians and without prompting international criticism.[time.com]

Also:

Second, Mr. Putin's autocratic form of rule and imperialist policy toward non-Russian nations has made it impossible for him to resolve - or even seriously address - the underlying problem that fuels most of the attacks.[washingtonpost.com]