Was it ethical for countries to look out for purely just their own citizens / nationals overseas abroad and leave the citizens of other countries to their own devices when the people in those other countries are enduring impoverishment and political oppression?
I am actually an anarchist but to answer your question I would say yes. A government is an artifice that is maintained to protect its citizens and enforce its borders. That is its role/job. There are some political campaigns somewhat based on foreign aid but they tend to be more private as the general public would not like their tax money leaving the country they feel they are part of. Plus, most foreign aid is usually allocated in advance. Any sudden emergency aid is discretionary.