I was thinking for my game, I would lead off with
1.the Ukrainian war going hot with Russia (Russia stepping in to save Russian speaking Ukrainians) sorry had to wait till i stopped laughing
2.NATO involvement in Poland Push Russia over the edge (Putin's Fear of western aggression).
3.North Korean invasion of the south.
4. Indo-Pakistani wars #5 leads to Chinese involvement
5. Iran Israeli war (Ad nations as you see fit)
6. etc. = nuclear war
have not got the story written yet but this is the outline with a game start date of 2030.
advice welcome