New York Consolidated Laws, Military Law - MIL § 22-a. Compacts for military aid

1. a. With the prior or subsequent consent of the congress of the United States, the governor is authorized to enter into, amend, supplement and implement agreements or compacts with the executive authorities of other states and the Dominion of Canada and any of the provinces thereof, providing for mutual military aid, and matters incidental thereto, in case of invasion or other hostile action, disaster, insurrection, or imminent danger thereof.

b. Such agreements or compacts may include but shall not be limited to provisions for joint military action against a common enemy;  for the protection of bridges, tunnels, ferries, pipelines, communication facilities and other vital installations, plants and facilities;  for the military support of civil defense agencies;  for the fresh pursuit, by the organized militia or military forces or any part thereof of a signatory into the jurisdiction of any other signatory, of persons acting or appearing to act in the interest of any enemy government or seeking or appearing to seek to overthrow the government of the United States or of any signatory;  for the powers, duties, rights, privileges and immunities of the members of the organized militia or military forces of any signatory while so engaged outside their own jurisdiction;  for such other matters as are of a military nature, or incidental thereto, and which the governor may deem necessary or proper to promote the health, safety and welfare of the people of this state;  for the allocation of all costs and expenses arising from the planning and operation of such agreements or compacts.