Cosmarauder

The story is set around the year 2080. The political situation on Earth is escalating due to geopolitical conflicts and the effects of climate change, threatening to split the alliance between the USA, ESA (EU, Canada), China, Russia, Japan, India, and Brazil, which currently operates the International Mars City with 1000 inhabitants.
When the USA, ESA, and China simultaneously develop a highly efficient fusion reactor and propulsion system, the collapse of the alliance becomes inevitable, sparking a renewed space race. Even the old alliance between the EU and the USA is no longer secure, as it is clear that any state that wants to maintain power and not be destroyed by the effects of climate change needs the valuable resources of space, which can now be obtained in large quantities with the new propulsion system.
You are a young captain of a frigate equipped with the new propulsion system from one of the aforementioned nations, tasked with protecting other ships like miners and transporters from other nations, mercenaries, and pirates.
If you do this job well, you will rise in the military and command larger ships or space stations.
However, it is also possible for you to desert or become corrupt for your own benefit.
You can secretly hoard resources for yourself, become a pirate or mercenary, or switch sides and help another military.
But beware, pay attention to the loyalty of your crew, otherwise, they will not follow you on this path and will either betray or mutiny against you and depose you.