Absolutely if the citizens aren’t prioritized they will resent leadership which makes for a weaker country

Both must be considered dynamically. On some issues, domestic action must be prioritised and on others a foreign policy approach is necessary. The proportion of prioritisation is balanced on a complex web of variables: political, economic, social etc. A government may have to enact policy changes to protect citizenship from external problems but this does not equate “deprioritising” foreign cooperation.