Book 6 in the Shadow Strike series.
"One man stands behind the transfer of high-level military hardware to an international terrorist syndicate. The CIA has uncovered his identity: Yuri Sidorov, a Russian arms dealer with state protection. With the arms deal only days away, David and the team are faced with an impossible challenge: to get close enough to take out their target, they must first win his trust.
David and the team infiltrate a black market arms network in Serbia, negotiating a web of secret police and mafia hitmen. Each wrong turn may prove fatal, but they’re determined to succeed at any cost. But Sidorov is still alive for a reason, and when the team uncovers dark forces at work in the Balkans and America, they realize that killing him is the least of their worries."