215 ILCS 5/161

In the event that a foreign or alien company is a party to the agreement of merger or consolidation or plan of exchange, the agreement or plan shall be executed by the proper officers of such foreign or alien company when they are duly authorized thereto by such action on the part of the directors, shareholders, members, or policyholders of such foreign or alien company as may be required by the laws of the domiciliary state or country of such foreign or alien company.