So similar to Tom Clancy's Red October
I'm really surprised when I found out, reading the posts here, that Red Sparrow was a novel first. The setup is different but the premise is very much the same.
Young Agent gives up older (in Red October dying agent) so he can establish himself within the Russian government. Sort of main guy in Red October goes rogue with the submarine because a drunk Russian surgeon botched up his wife's surgery and couldn't be processed because his father was a party leader.