Luke Harding of The Guardian has been covering the Ukraine war since it started in February last year. He is just back from his latest trip to Kiev and spent a long time on the front line talk to various Ukrainian commanders. And they say actually, counter-offensive isn't quite the right word. They talk instead about a sort of rolling spring summer campaign. We've seen lots of what you might call tactical operations - smashing up Russian tanks, armored vehicles, bombing,. using drones, oil refineries, weapons dumps and so on.