Hi there!
This looks amazing so far; and ive got a couple things i would add:
1: make a mode where you can control a country completely, you can choose the alliance, who to attack, exc and that there isnt a bot who also makes decisions (ive seen a country fall apart cause of stupid bot mistakes)
2: make alliances a bit more diverse. making it so you can ally multible countries (so 1 is allied to 2, 2 is allied to 3 but 3 isnt allied to 1, you get me?) this would create interesting wars imo.
3: an earth map that is a lot bigger then current earths map (the current earth map is simply quite small lol)
4: add music and drastically reduce the sound effects when nations attack eachother, make alliances, make peace, exc.
the game looks great so far, props to you!