• The Pentagon is drafting a new nuclear strategy with a focus on tactical weapons.
• The shift aims to address a credibility gap in the US deterrent.
• Critics warn of the risks of 'limited' nuclear use.
• The review is driven by Russia and China's expanding nuclear capabilities.

This shift in nuclear doctrine may indicate a growing concern about the credibility of the US deterrent, which could lead to a more unstable security environment. The expansion of tactical nuclear options suggests a desire to close the credibility gap, but it may also increase the risk of nuclear conflict, which could have significant implications for global security and stability.