Crossword puzzle clue "pact between two countries"

Pact between two countries

Kind of commercial pact where two countries agree to treat each other as well as any other

Yankees manager of the '70s between two Billy Martin stints and of the '80s between two Gene Michael stints

It may be a boundary between neighboring countries ... or what each set of circles depicts?

Neutral area between warring countries, briefly

Trade restriction between countries

Friendly agreement between countries

Contest between teams from different countries