Limit missile defense - or expand it?

Since 2002, when the United States withdrew from the Anti-Ballistic Missile Treaty, the international arms control regime has included no limits on missile defense. Washington wants to keep it that way, insisting that it "will continue to reject any negotiated restraints on US ballistic missile defenses." Many experts believe that missile defense undermines strategic stability; but some argue that missile defense can play a role in denuclearization. Here, Wu Riqiang of China (2015), Tatiana Anichkina of Russia (2015), and Oliver Thränert of Germany debate whether arms control arrangements should include limits on missile defense - or whether advances in missile defense should be encouraged because they might contribute to disarmament.