A Russian jihadist known as Salakhuddin, who is fighting with the rebels in Syria, is urging North Caucus jihadist Muslims who are itching to join the fight to stay at home and wage war there.
"...fight in the lowlands if you can’t go to the mountains,"or alternatively to travel to Moscow or other Russian cities to target the enemy there, or prepare to sabotage the Winter Olympics in line with Umarov’s instructions.
He points out that jihad does not necessarily involve joining a large fighting force, and that individuals or groups of up to three fighters can inflict considerable damage if they set their minds to it. In that context, he quotes Chechen field commander Shamil Basayev's observation that "modern technology enables one man to inflict irreparable damage on the infrastructure of the enemy state."
Doku Umarov has threatened violence at the 2014 Winter Olympics. Good luck with those.