Scarecrow and the Army of Thieves - Matthew Reilly

At an abandoned Soviet base in the Arctic, a battle to save all life on Earth is about to begin...

THE SECRET BASE
It is a top-secret base known only as Dragon Island. A long-forgotten relic of the Cold War, it houses a weapon of terrible destructive force, a weapon that has just been re-activated...
AN ARMY OF MURDERERS
When Dragon Island is seized by a brutal terrorist force calling itself the Army of Thieves, the fate of the world suddenly hangs in the balance. But there are no crack units close enough to get to Dragon in time to stop the Army setting off the weapon.
ONE SMALL TEAM
Except, that is, for a small equipment-testing team up in the Arctic led by a Marine captain named Schofield, call-sign SCARECROW.

It's not a strike team; just a handful of Marines and civilians. It's not equipped to attack a fortified island held by a small army. But it will go in anyway, because someone has to.
THE ULTIMATE HERO IS BACK, FACING THE ULTIMATE ARMY OF VILLAINS.