Русско-англо-русский юридический словарь

Mutual aid agreement means a written agreement between agencies, organizations, or jurisdictions to lend assistance across jurisdictional boundaries. (USLegal)

Mutual aid is arguably as ancient as human culture; an intrinsic part of the small, communal societies universal to humanity's ancient past. From the dawn of humanity, until far beyond the invention of agriculture, humans were foragers, exchanging labor and resources for the benefit of groups and individuals alike. (Wikipedia)