Thomson Reuters A Department of Defense document obtained by HuffPost calls for adding "low-yield" nuclear weapons to the US arsenal in order to counter Russia, Iran, North Korea, and other countries. These low-yield weapons would roughly be equivalent to the bombs dropped on Japan in 1945. The US already has over 1,000 such weapons, and experts say America's current nuclear capabilities are already flexible enough to counter and deter outside threats without additional weapons. President Donald Trump's Defense Department wants to expand American nuclear capabilities by adding "low-yield" weapons of the kind that decimated Nagasaki and Hiroshima to the US arsenal, according to a draft Pentagon policy document obtained by HuffPost. The document, called the 2018 Nuclear Posture Review, lays out what appears to be a new approach to nuclear deterrence that relies on acquiring weapons with comparatively "low"-level destructive capabilities meant to convince nations like Russia, China, Iran, and North Korea that the US has weapons in its arsenal that it would hypothetically be willing to use. But as HuffPost notes, these weapons "supplements" are by no means as harmless as they sound — their destructive power is roughly akin to the bombs dropped on Nagasaki and Hiroshima in 1945.