Since the Ukraine war began four years ago, Putin has issued dozens of explicit or implicit nuclear threats. Depending on the methodology used, some analysts estimate that Putin’s nuclear threats have ...

Editor’s note: This is part of the “Nuclear winter: Why study it now?” series. The Russian invasion of Ukraine has revealed how easily modern, interconnected food systems can be disrupted by armed ...

Russia has begun nuclear war games and moved Iskander-M missiles into Belarus, on the doorstep of the European Union. Ukraine has rushed troops to its northern border, and Nato has condemned the ...