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Exacerbating this danger is the deliberate and accelerating breakdown of the arms control architecture that for decades provided restraint, transparency, and predictability for each side’s conventional and nuclear forces. In their absence, Russia and the West are assuming and planning for worst-case scenarios. The first crack appeared in 2002, when the United States withdrew from the Anti-Ballistic Missile (ABM) Treaty, signed three decades earlier to prevent Washington and Moscow from deploying nationwide defenses against long-range ballistic missiles. Five years later, Russia effectively suspended another landmark agreement, the 1990 Treaty on Conventional Armed Forces in Europe, and NATO followed suit. The 1987 Intermediate-Range Nuclear Forces (INF) Treaty—which banned an entire class of destabilizing nuclear-capable missiles on European territory—has been dealt a likely fatal blow with this year’s decisions by Washington to withdraw from the treaty and by Moscow to suspend implementation of it.

The fate of the Comprehensive Nuclear Test Ban Treaty is also in doubt, with four Republican U.S. Senators writing to President Donald Trump this past spring asking if he would consider “unsigning” the treaty. The future of the 2010 New START treaty is also unclear

At the same time as checks on existing weapons are falling away, new technologies threaten to further destabilize the military balance. Sophisticated cyberattacks could compromise early warning systems or nuclear command-and-control structures, increasing the risk of false alarms. Prompt-strike forces, including delivery systems that pair conventional or nuclear warheads with a hypersonic boost-glide vehicle or cruise missile, can travel at very high speeds, fly at low altitudes, and maneuver to elude defenses. If deployed, they would decrease a defender’s warning and decision time when under attack, increasing the fear of military planners on both sides that a potential first strike could deliver a decisive advantage to the attacker. Then there is the militarization of outer space, a domain that remains virtually unregulated by agreements or understandings: China, Russia, and, most recently, India have built up their antisatellite capabilities, and Washington is mulling a dedicated space force. 

the absence of dialogue between Russia and the West—in particular, between civilian and military professionals in the defense and foreign ministries. The current disconnect is unprecedented even when compared with the height of the Cold War

The United States and its NATO allies are now stuck in a retaliatory spiral of confrontation with Russia.

transatlantic discord has damaged the perception of NATO as a strong alliance

By virtue of its vast geography, permanent membership in the UN Security Council, rebuilt military, and immense nuclear forces, Russia can disrupt geopolitical currents in areas vital to the interests of the United States, including Europe, the Middle East, Asia, and the Arctic. Further clashes and crises are not just possible but probable

The fact that Trump and Putin reportedly agreed to a new dialogue on strategic stability and nuclear dangers at a meeting in Helsinki in July 2018 was a step in the right direction. But their inability to follow through—including at the level of civilian and military professionals, who need the green light from their leaders—underlines how dysfunctional relations have become

the United States and Russia could take more specific steps to reduce the likelihood of a new nuclear arms race—of vital importance for international security, particularly in light of the probable demise of the INF treaty. All nations have an interest in seeing the New START treaty fully implemented and extended through 2026, the maximum five-year extension permitted by the treaty.

Today, decision-makers in Washington and Moscow have only a precious few minutes to decide whether a warning of a possible nuclear attack is real and thus whether to retaliate with a nuclear attack of their own. New technologies, especially hypersonic weapons and cyberattacks, threaten to make that decision time even shorter. The fact that Russian troops are deployed, and routinely conduct military exercises, in Russia’s western regions close to NATO’s boundaries, and NATO troops are deployed, and have recently conducted military exercises, close to Russia’s borders further raises fears of a short-warning attack. Such shrinking decision time and heightened anxieties make the risk of a mistake all too real. Leaders in both Washington and Moscow should clearly direct their military leaders to work together on ways to minimize such fears and increase their decision time

leaders in Moscow, London, and Paris could once again become consumed with fears of a short-warning nuclear attack that could decapitate a nation’s leaders and its command and control, which would greatly increase the risk of false warnings.

Exchanging more information about each side’s operations and capabilities could help ensure that prompt-strike systems, such as modern hypersonic missiles, do not further erode strategic stability. This is primarily a U.S.-Russian issue, but with China’s reported development of hypersonic missile capabilities, addressing it will ultimately require broader engagement. It would also help to offer more transparency on nonnuclear prompt-strike systems and commit to segregating these conventional capabilities from nuclear-weapons-related activities or deployments.

Cyberattacks on nuclear facilities, nuclear command-and-control structures, or early warning systems could cause miscalculations or blunders, such as a false warning of a missile attack or a failure to prevent the theft of nuclear materials. As states continue to develop and refine their ability to attack satellites, the United States and Russia could be blinded in the early stages of a conflict.

the understanding, first articulated in 1985 by U.S. President Ronald Reagan and Soviet leader Mikhail Gorbachev, that “a nuclear war cannot be won and must never be fought.” Affirming this principle was an important building block to ending the Cold War.

some have suggested abandoning U.S.-Russian talks and waiting for new leadership in both countries. That would be a mistake. Dialogue between the two presidents remains essential: only that can create the political space for civilian and military officials in both nations to engage with one another in discussions that could prevent catastrophe

Washington and Moscow are acting as if time is on their side. It is not.