various foreign countries; several foreign countries
Refers to multiple foreign nations collectively, often used in news or formal contexts.
Leaders from various foreign countries attended the conference.
This policy has been criticized by several foreign countries.
諸国 means various countries in general, not necessarily foreign; 諸外国 explicitly means foreign countries.
Compound of 諸 (sho, 'various') + 外国 (gaikoku, 'foreign country').