Indeed, Nordic cooperation, both in business and in civil service, switches to English when the Danes get involved even though some cooperation between Swedish

Indeed, Nordic cooperation, both in business and in civil service, switches to English when the Danes get involved even though some cooperation between Swedish and Finnish entities may be conducted in Swedish. People from Finland, especially ones whose native language is Finnish, have even more trouble understanding Danish pronunciation than Swedes or Norwegians do. Switching to English doesn't require people from different countries, though. While in Helsinki Finnish-native and Swedish-native speakers typically speak Finnish with each other, there are parts of Finland where Swedish-speakers might not be fluent in Finnish and the most efficient mutual language with Finnish-speakers (who often aren't fluent in Swedish) is English.