An assistance treaty is an agreement between two or more countries to provide support and help each other when needed. It is like a promise to come to each other's aid in times of trouble or crisis. Full definition
Use of mutual legal assistance treaties (MLATs) is required — a costly, time - consuming process. (canadianbusiness.com)
Canada has, with the United States and with other countries a series of mutual cooperation arrangements (including Mutual Law Assistance Treaties or MLATs) in place between Canadian and U.S. law enforcement by which criminal and terrorist conduct can be investigated and relevant information exchanged. (slaw.ca)
Co-operation with third countries (those outside the European Economic Area) is dependent on their ratification of relevant international agreements or the existence of a mutual assistance treaty agreed between them. (globalinvestigationsreview.com)