Fiction books told from the perspective of a government during a crisis, e.g. a geopolitical incident

Basically the few times I've come across books (or film/TV) where a government has to react to a crisis, I've loved it.

I want something that wholly focuses on things from a political perspective. How the government is responding. For e.g. in the case of, say, an invasion I'm not interested in spies behind enemy lines or troops on the frontline, just the politicians making critical decisions.

Ideally it'd be an international relations/geopolitical incident, but any kind of crisis is also welcome.

I was considering Tom Clancy (I've never read a Tom Clancy), so any recommendations there would be useful (again, as long as it's not focused on agents shooting guns and taking out bad guys, I just want things from the government's perspective).