The post-Cold War order is slowly but surely coming undone. This is attributable to the deteriorating relations between two of the world’s great powers: Russia and the US who acted as guarantors of the global order.
One of the central planks of the order is the suite of international arms control treaties such as the Nuclear Non-Proliferation Treaty, the Treaty on the Limitation of Anti-Ballistic Missiles, the Strategic Arms Reduction Treaty, and the Comprehensive Nuclear Test Ban Treaty (CTBT).