Despite temperatures below -20C attacks are targeting not just electricity and gas infrastructure in Ukraine, but heating plants which supply thousands of homes at a time.

Is there any military logic or justification? Colin Freeman updates us from the city of Kharkiv, and Simon Newton explains how the extreme cold affects everything from drone batteries to the targeting of artillery shells.

As the final nuclear-arms-control treaty between Russia and the US expires, Professor Michael Clarke explains why Britain’s nuclear deterrent has just become more important.

And after a doubling of drone-sightings near UK military bases will new powers for the Armed Forces to shoot them down be the solution, or is that too low-tech?