States — Conduct of foreign relations — Contract for sale of weapons by commercial undertaking to foreign State — Whether justiciable in French courts — Contract subject to authorization of French Government — Whether such contract constituting an acte de gouvernement — Whether severable from conduct of foreign relations by French Government

Economics, trade and finance — International arms sales — Private company concluding contract for sale of military aircraft to foreign State — Requirement of Executive authorization — Whether municipal courts having jurisdiction to examine legality of such contracts — The law of France