The Canadians have always gone with twins for Northern air defense - CF-100, CF-105, Voodoo and F/A-18.
The Swedes on the other hand have never seriously contemplated a twin-engine fighter (while operating a twin-jet trainer for ever). But you'll notice that their fighter engines, or the main bits of their fighter engines (JT8D-based RM8, F404-based RM12), have always been well wrung out by someone else before they get into RSwAF service.