When opposing countries reach an understanding or truce, that's detente, meaning a loosening of tensions.

If two nations are having problems, such as disagreements over trade, or even the threat of war, and then they become friendlier to each other, they've reached a state of detente. Detente is a relaxing of tension: diplomacy is working and the countries are on the path of peace rather than the road to war. If you always argue with your sibling, and then you start getting along better, you could humorously say that you've reached a detente.

Definitions of detente

n the easing of tensions or strained relations (especially between nations)

Type of:
alleviation, easement, easing, relief
the act of reducing something unpleasant (as pain or annoyance)

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