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[Pacific Rim] What happens to the world politically?

Humanity was unified whilst fighting off the Kaiju. After the breach has been closed, there is no immediate reason for that unification any more. We know food has been rationed and is therefore in short supply, at least near the pacific coast, presumably in all of the countries surrounding the pacific. Kaiju will also have destroyed fossil fuel production in the pacific.

Three superpowers border the pacific rim, Russia, China and the US. All are shown to have the capability to construct their own Jaegers. China has an operational Jaegerbase for sure. What will happen when any of these countries decide to secure their interests, using weapons that could defeat creatures that could hardly be stopped by conventional means?
gpt
In the immediate aftermath, things didn't change much. There was Kaiju mess to clean up and good will to spread. Nobody was 100% sure that the Kaiju weren't coming back, and it was a tense couple months.

After that, the major governments busied themselves with framing the events of the final Kaiju assault in their favor, most notably distancing themselves from the Wall of Life, claiming credit for training, equipping, supporting, or building the teams that made the final assault successful. 

It wasn't until a few years later that everybody forgot what had happened. It started with initiatives to tear down the fragments of the Wall for environmental reasons. Then came the arguments about who owned the property rights for the land was built on, and all the land of the old Jaeger stations. Finally the major governments started getting prickly, claiming that one country or another owed somebody else for damages or cleanup or usage of land. 

Despite the obvious natures of the Jaegers, they never served a true role in the cold war that followed. To a politician, they were all the same giant robots, everybody needed one or two, damn the cost, but they were never really viable for any combat, especially urban combat against conventional weaponry. The true arms buildups were the missiles and bombs that had been developed to fight Kaiju when Jaegers failed, the kind that threatened to take entire cities along with their Kaiju targets, the last resort kind. 

We forgot about the lessons that the Kaiju taught us, about working together and trusting each other. We forgot the brief immense success we had and fixated on drawing borders and giving political and financial credit. China started calling in old debts, banking on their Jaeger base to strongarm the first world politically. With so many Jaegers, defunct or not, the US started to look less like a powerhouse and more like a tyrant, despite the fact that it had taken some of the worst damage during the war against the Kaiju and really wasn't in financial shape to make moves. 

European countries including Russia, who hadn't taken much damage during the war, started to look much better, using funds that the US and other Pacific-bordering countries didn't have to fund improvements and make moves financially. The US never went bankrupt, but it lost more face than ever, ending up a country wracked with poverty, crime, riots, and disappointment, the decaying Jaegers in their ports a reminder of what was lost. 

When calling in the US's debts made less money than expected, China cut off connections from the rest of the world in an attempt to "focus inward and rebuild", presumably to hide the massive damage and Kaiju waste that it never really got around to cleaning up. 

Riding high off of successes in the Kaiju war and relatively little losses, Russia became the world's economic and political powerhouse. It established a number of powerful alliances in the Mediterranean, where secret arms contacts eventually led to the installation of missile bases and even Jaeger stations along the coast of the Mediterranean and Atlantic that far outpaced what NATO had there pre-Kaiju. 

Eventually, the world settled into a new place, albeit a slightly more dysfunctional one than before. Unfortunately, the ill will between countries, rampant corruption and hushed up failures to finish cleaning up the waste from the Kaiju war, and military buildup that was more for show and intimidation than fighting any true enemy meant we were unprepared.

Unprepared for when they came back.