Iron Sunrise by Charles Stross

In a universe where interstellar travel is possible through wormholes, a devastating attack obliterates the planet of Moscow, setting off a chain of events that threatens the delicate balance of galactic peace. The story follows Rachel Mansour, a UN intelligence agent, and Martin Springfield, a freelance journalist, as they unravel a conspiracy involving a doomsday weapon and a mysterious group known as the "ReMastered." As they race against time to prevent further destruction, they navigate a web of political intrigue, espionage, and advanced technology, discovering that the fate of entire worlds hangs in the balance.

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