Once you choose a country, it will ask you what you want to do, it will give responses depending on your resources, all alliances have been disbanded however new ones can be built, countries can declare war on you, research is required for vehicles like tanks and bomber aircraft’s, research will be required for nukes as well. It will not you what to do however it will tell you responses for what you say, it will also be fairly accurate so a world superpower won’t just surrender instantly.