How do you deal with an international free rider problem? If the word collectively agreed to fund research then I would love for all results to be released publ

How do you deal with an international free rider problem? If the word collectively agreed to fund research then I would love for all results to be released publicly, but how do you stop countries from free riding off of the R&D from other countries? From a game theoretic perspective it seems that countries who are fully self interested (putting aside notions of fairness/ethics, which I wish would be enough to lead to desirable outcomes but is unfortunately not the case) would clearly choose to just free ride off of the developments of other nations, and reap the fruits of reward while spending that money elsewhere (potentially in ways that could end up hurting the researching country, like the free rider spending it on their military).