If a hostile country has installed a puppet leader to dismantle your government from the inside, and violent revolution would only expedite your governemnts destruction, how do you combat it?

Assuming we’re thinking of the same place, you have to deal with a large group of people who have been fooled, and are about to get very angry and need a target they can reach for their anger. Highlighting mid to high level members of their party leadership as the people to blame allows them to hold their great leader blameless, protecting their egos, while at the same time ripping down the pillars that prop up that same leader. Calling for new blood to support… whatever leader you’re talking about, and voting out “those idiots that aren’t giving him what he needs and so we all are suffering” allows the malleable followers to self destruct the party apparatus like ants eating away the bones of an elephant.