Ukraine building '600-mile wall of death' to end Putin's invasion once and for all

However, while Ukraine is shoring up its defences the army cannot be seen to just dig in and sit still, defence analysts have said. "The issue for the Ukrainians is they don’t want to just go static,” Edward Arnold, from think tank RUSI, told The Telegraph. "If the lines go static and they don’t move at all, that’s not great from a political point of view."