Antinuclear

(CNN)During his first two and a half years in office, President Donald Trump and his administration have laid waste to numerous international agreements originally designed to strengthen US security, bolster US alliances, and constrain US adversaries. The toll has been particularly high with respect to deals concerning nuclear arms control and nonproliferation.

Over the past 14 months, the administration has withdrawn from the 2015 Iran nuclear deal and abandoned the 1987 Intermediate Range Nuclear Forces (INF) Treaty. Both of these valuable agreements have been discarded without a viable plan to replace them.

Now the administration is signaling that it might jettison yet another nuclear pact, the2010 New Strategic Arms Reduction Treaty (New START) with Russia. Doing so would be the height of folly and would deal a significant blow to US national security. With the US withdrawal from the INF Treaty having just taken effect on Aug. 2, New START will be the only remaining agreement constraining the size of the world’s two largest nuclear arsenals. Were New START to disappear, for the first time in nearly half a century there would be no legally binding limits on American or Russian nuclear stockpiles. The risk of unconstrained US-Russian nuclear competition, and of even more tense bilateral relations, would grow.

New START also includes a comprehensive monitoring and verification regime to ensure compliance. But the agreement is set to expire on Feb. 5, 2021. Under its terms, it can be extended by up to five years if both presidents agree.

In an appearance before an activist group this summer, however, US National Security Advisor John Bolton, who before joining the administration calledNew START an “execrable deal,” said that while no decision has been made, he thinks an extension is “unlikely.”