Russia's ability to outmatch Ukraine with artillery barrages on the battlefield has significantly reduced to just 1.5 Russian rounds for every Ukrainian shell fired back, Western officials have said. This compares with Russian forces launching at least five times as many artillery rounds as Ukraine could in the war previously - with the ratio at times much higher even than that. The Western officials, speaking on the condition of anonymity, put the levelling out down to a "wide variety of factors". These factors include limitations in Russia's defence production lines, difficulties with transporting more rounds to the frontline by rail,...