If you’re asking about hints, that requires a lot more time and thought. However, there are some similarities between them that I can briefly go over. In my opinion, it makes for excellent shipping material.
For starters, they’re both incredibly insecure individuals. They want to make friends but have trouble doing so, and don’t always recognize that what they’re doing is wrong.
Ex: America being nosy and poking into everyone’s business, and Russia’s cruel treatment of other nations under his rule.
Personally, what I would use as a good focal point for conflict is the fact that they both think everyone hates them:
Ellawritesficssometimes 