Officially the UK is no longer a member of the EU, Brexit happened on 31st January, in theory the two sides are trying to find an agreement that covers everything from trade to fishing, immigration to security. But what chance of a deal when the EU is accusing the UK government of breaking its word over the divorce deal signed in January. Boris Johnson says he's sticking to his plans to change the Withdrawal Agreement, but Brussels says he must drop it or any deal is off. Is it a battle over principle or just brinkmanship? Anand Menon is one of the leading authorities on the UK and the EU. He is professor of European Politics and Foreign Affairs at King's College London, and heads up the thinktank 'UK in a Changing Europe'. He can be found tweeting at @UKandEU. How did we get here? Explaining the news is a podcast from 5 News. Join Andy Bell as he explains the world's biggest news stories through interviews with politicians, experts and analysts.