If any Extraordinary Event not falling within Article 15.1.2 occurs and as a result thereof any obligation of either party is suspended pursuant to Article 11.2, the Parties shall both use all reasonable efforts to cause the Extraordinary Event to cease as soon as possible and the costs and expenses incurred in connection with any action taken pursuant to this Section 11 shall be borne by the Parties in such proportions as shall be fair; provided that neither party shall by reason of this provision be obliged to accede to any unreasonable demands of any governmental or other authority, corporation, or other person or group of persons