International duty, what's that?
Oh, is it that that thing where you assemble the best players from one country and play the best players from another (just for arguments sake let's call this other country "Russia")? And you play at set times of the year (again for illustrative purposes I'll call these allotted time periods "windows"), and those times of the year don't change much and are known well in advance so you have plenty of time to organise a game?
Is it that thing?
What a novel concept.