RAF Typhoons join an air defence operation following Russian incursions into Polish and Romanian airspace. They’ll work with allied forces, including France, and Germany, helping to defend the eastern flank as part of Nato's Eastern Sentry. Sitrep digs deep with Forces News reporter Simon Newton.

Also President Trump’s state visit to the UK is breaking military ceremonial records.  Sitrep talks to General Sir Nick Parker, former deputy commander of ISAF, about how intertwined UK forces are with US ones.

And as world events are brought directly to our mobile devices Sitrep speaks to the author of a book looking at how the military must adapt to fighting wars with the smartphone.

Kate Gerbeau presents, with expert analysis from Dr Karin von Hippel.