Day 512.Today, we bring you updates from the battlefront, analyse the reported arrest of Igor Girkin in Russia, and speak to friend of the podcast John Spencer - Chair of Urban Warfare Studies at the Modern War Institute - about his recent research trip to Ukraine. Contributors:David Knowles (Host). @djknowles22 on Twitter.Francis Dearnley (Assistant Comment Editor). @FrancisDearnley on Twitter.Roland Oliphant (Senior Foreign Correspondent). @RolandOliphant on Twitter. John Spencer (Chair of Urban Warfare Studies). @SpencerGuard on Twitter. Maria Romanenko (Ukrainian journalist). @rommari on Twitter. Subscribe to The Telegraph: telegraph.co.uk/ukrainethelatestEmail: ukrainepod@telegraph.co.ukSee Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.