There are only so many weapons in the world to go round, so the laws of supply and demand leave Ukraine struggling even more to get what it desperately needs.

And Russia’s been thrown an economic lifeline by a double whammy of surging gas and oil prices, along with weakened sanctions.

Professor Michael Clarke explains how all this will impact the battlefield, and Colin Freeman gives us insights from his latest visit to Ukraine.

Also on Sitrep, some of Britain’s top Army officers are reshuffled in the name of strengthening our contribution to NATO.  Lieutenant General Sir Simon Mayall, former Deputy Chief of Defence Staff, tells all about the jobs and people involved.