support offered by nato allies, including a signal they say will be shown when borisjohnson visits this region and the military support presidentjoe biden announced, the fourth technical batch of military support in recent weeks arrived here in ukraine. russia says it has no plans to invade ukraine but we see troops massing along the border and ukraine says it is preparing for the worst while saying it is not certain russia will invade. if they do, what is the balance of forces? we are joined by an associate fellow at the russian erasure programme at chatham house. —— eurasia. what impact would