The changing language used by the Ukrainian military in 72 hours of daily updates tells the story: “Ongoing defensive fighting.” “Significantly worsened.” Russian “tactical success.”You rarely ever hear Kyiv’s top brass sounding downbeat, but their steep southerly trajectory reflects the grave place Ukraine finds itself in. Russia is not just advancing slowly in one place; it appears to be advancing in four, across the frontline.Moscow knows it is on the clock: in about a month, the $61billion of US military aid will start to translate into Ukraine having the weapons it has been begging for. So, Russian President Vladimir Putin...