Vladimir Putin’s invasion of Ukraine united the EU in shock and outrage. But four weeks into the war, with Ukrainian cities besieged and civilians suffering unimaginable horrors, cracks are already evident in the European response. Stephen Sackur speaks to the EU Commissioner for Financial Services, Mairead McGuinness. How far should sanctions go? Solidarity with Ukraine is one thing, but is the EU prepared to endure real pain to support Kyiv?