Welcome to the forum
Iran: All hate Iran. Almost no one rules out military action with it. Conservatives tend to be more aggressive.
Russia: All hate Russia. Not too many policy proposals, except for hating Russia and condemning Putin.
Venezuela: Republicans love demonizing Venezuela, Democrats tend to agree but much less aggressively. Not too many policy proposals, again.
China: Not very much of a partisan split here. Some Democrats are protectionists and support raising the tariff with China 27%, some are like Bill Clinton and support more free trade. Republicans have similar splits. These splits are quite strongly associated with the base of each district/state; states with strong industrial-based economies are less in favor of trade with China than those with weak ones. A few Democrats believe we should boycott the Olympics because of China's support for the government of Sudan.
NATO: Not an issue.
UN: Not an issue, except for some fringe libertarians who support withdrawal.
Darfur (not mentioned in your post): Some Democrats and a tiny bit of Republicans support intervention/military action in Darfur.
