Protesters on Monday seized a mansion linked to the sanctioned Russian oligarch Oleg Deripaska in one of central London’s most exclusive addresses. Banners were unfurled from the property at 5 Belgrave Square, including one stating “This property has been liberated”, alongside the Ukrainian flag. Police, who were called out in the early hours, set up a cordon before later using a drill to break open the front door to gain entry and used a crane to access the balcony. One of those inside told AFP by telephone: “We are a property liberation front. That’s what we do. It’s not really squatting, it…