Where State A's breach absolutely prevents State B's performance (e.g., where State A bars access to its territory or to resources indispensable for the performance by State B of its obligation), State B will be able to plead force majeure.
当甲国的违背行为彻底阻止乙国的履行例如，当甲国阻止乙国为履行其义务不得不进入其信封或获得资源时）乙国将能够以不可抗力来抗辩。