There were and always will be the problems,The main factor is trade balance,Countries are always trying to protect balance between import and export,then they set up embargo and tariffs which is very bad decisions for protectionists and countries with cheap labour power,after this the relationships between the countries may be not as good as it was,So then international relations decide a lot in this situation,They create too many international organizations and agreements which may be useful and peace-maker for this countries.
Yes, the world economy doesn't affect bitcoin price or the crypto market itself, in my part world economy is more volatile than crypto markets, some countries are giving their all to preserve their economy, But i think it is not enough, Considering crypto as a support in every countries economy will be a really big help, Bitcoin has a lot to offer to boost the world economy itself.