Book 4 in the Jayne Robinson series.
"CIA checkmated . . . A defecting oligarch meets a grisly death in London over a game of chess. CIA investigator Jayne Robinson is sent to Moscow on a high-risk mission to find out why. And the US president prepares for a crisis summit as Russia grabs a chunk of Ukraine.
The dead oligarch is apparently ready to pass on top secret information about the Kremlin’s increasingly hostile plans and strategy. But he never gets the chance.
Operative Robinson is dispatched to Moscow to extract information from a highly-placed asset in Russia’s foreign intelligence service."