What is the ruling on studying political sciences and working in various state agencies (such as the Ministry of Foreign Affairs, the Ministry of Oil, or security agencies) in light of the existence of injustice on the part of the state?

There is no objection to studying political science, but one must distinguish between truth and falsehood within it by understanding Islamic political principles. This is commendable for anyone who wishes to support a truth or repel a falsehood. As for working in the ministries and institutions of unjust states, it is permissible if the work itself is inherently permissible and does not aid in injustice or falsehood; otherwise, it is not permissible.