noun
treaty of friendship
A formal agreement between nations to establish or maintain friendly relations.
両国は友好条約を締結した。
The two countries concluded a treaty of friendship.
平和条約 is a peace treaty, typically ending a war, while 友好条約 is a treaty of friendship, often establishing or reaffirming friendly relations without necessarily following a conflict.
Compound of 友好 (friendship) and 条約 (treaty).