Iran could restart aspects of its nuclear program if President Trump declines to renew sanctions waivers this month, leaving major powers with few options for monitoring or restricting it.

In striking Syria without an international law justification, the United States leaves itself open to criticism and may invite similar behavior by other countries.

Military threats to deter chemical attacks have so far failed to restrain the Syrian regime, and they risk escalating the horrific conflict even further.

The expulsion of Russian diplomats by more than twenty governments is a remarkable show of unity and a deepening of Moscow’s rift with the West.