mediated

When you argue with your friend and your disagreement is mediated, that means a neutral person has stepped in to help the two of you negotiate or come to an agreement.

Two kids fighting on a playground might need their dispute to be mediated by a calm grownup. Unfortunately, many of the fights that need to be mediated are between leaders of countries or feuding groups of fully grown adults. The Latin root of mediated is medius, or "middle," which makes a lot of sense when you imagine a referee standing in the middle of two angry soccer teams.

Definitions of mediated
1

adj acting or brought about through an intervening agency

“the mediated settlement brought satisfaction to both sides”
Synonyms:
mediate
acting through or dependent on an intervening agency