Thanks to the appearance of the Trump administration's Nuclear Posture Review we now know a little more about the future shape of the US 'triad' - the strategic bombers, land-based intercontinental ballistic missiles (ICBMs) and submarine-launched ballistic missiles (SLBMs) - and tactical atomic bombs. The last Nuclear Posture Review was in 2010 and the latest document proposes the large-scale renewal of the Pentagon's nuclear forces - a process set in motion by the previous Obama administration. In part, the US is responding to the increasing military capabilities - nuclear and conventional - of China and Russia, but it's also looking towards emerging threats in Iran and North Korea, as well as new threats in the space and cyberspace domains.
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