Those files you pulled out of Vezirzade's computer have given us a much clearer picture of what's going on. Kutkin has set up an operation somewhere in Siberia to turn the raw plutonium into working bombs. We need to know where it's located so we can go in and shut it down.
Kutkin's spa is in the countryside near Smolensk. He and his cronies snapped it up cheap during the break-up of the Soviet Union and have turned it into their own private resort. It's not particularly well guarded, but Kutkin has a number of houseguests at the moment so it may be tough getting in and out without being seen.