One month before the Winter Olympics begin in the Russian resort town of Sochi -- and in the shadow of last month's deadly bombings in Volgograd -- a huge security operation has swung into gear. 

A special exclusion zone went into force Tuesday under which only Sochi-marked vehicles, emergency or specially accredited intelligence service cars will be allowed into the wider Sochi area. 

Air traffic and sea access will be restricted, and everyone going into the zone will have to go through heavy security and identity checks. 

Russia is pouring huge resources into ensuring that the Games, seen as a flagship project of President Vladimir Putin, go off without incident. 

Two bombings in 24 hours last month in Volgograd, one targeting the city's main train station and the second a trolley bus, raised concerns of a potential threat to the Sochi event. 

No group has to date claimed responsibility for the attacks, but suspicion has fallen on Chechen separatist groups. 

A bitter battle for an independent Chechnya, lasting almost two decades, spawned an insurgency that has spilled into neighboring republics in the North Caucasus region, including Dagestan. 

Chechen warlord Doku Umarov, leader of the Islamist Caucasus Emirate group, last summer called on his followers to do what they can to disrupt the Games. He claims they will be held on the graves of Muslim occupants of Sochi, who he says were driven out by Russian imperial forces in the 19th century. 

Despite the shockwaves of the Volgograd attack, International Olympic Committee President Thomas Bach said he was confident that Russia would keep the Winter Olympics safe. 
Who is in charge of that group?
President Thomas Bach