US: The big dog. Huge military, huge economy, nuclear arsenal, and two votes on the UN Security Council if you count their satellite the rump United Kingdom of England-Wales-and-Northern-Ireland.
China: No.1 on the East Side.
India: Doing better now that Pakistan’s nuclear arsenal is decommissioned, but stability is still in issue in the world’s most populous country (more people than China as of 2030).
France: The pride of Europe. Oversized military boosted by a military alliance with similarly punchy Italy, independent nuclear arsenal not provided by those dirty Americans, preferential trade with most of Europe.
Japan: Remilitarized for the South China Sea conflict but ended up actually using those capabilities (including an independent nuclear deterrent) in the 2nd Korean War. Economically in shambles and on their way out due to what able-bodied people they have mostly being in the military.
Russia: Still limping along, thanks to a better trade situation for them in a post-EU Europe and the reformist authoritarianism of the Young Guard, who oustered the old United Russia mandarins.
Korea: The rising giant. Unified and nuclear armed coming out of the Second Korean War and already a great power despite still rebuilding and being on rationing. Despite the fact that the Japanese nuclear device only detonated in what was then psychotic North Korea, the fact all the same has increased their already strong hatred of Japan to fanatical levels.
Germany: Whereas the UK and Italy get their nuclear weapons and economic stability from the US and France respectively, Germany has no such weapons but is an independent economic powerhouse trying to hold the line in Europe and stop Franco-Russian meddling in the affairs of the independent nation-states.