The world this week
Politics Vladimir Putin’s forces bombarded cities in Ukraine, hitting homes, schools and clinics. In at least one besieged city, Russia violated a ceasefire intended to allow civilians to escape. Mariupol, a port, suffered an indiscriminate barrage, including of a maternity hospital. Ukraine’s vastly outnumbered forces fiercely resisted the invasion, killing thousands of Russian troops. Unarmed Ukrainian civilians staged protests in towns occupied by Mr Putin’s forces. Russia moved closer to encircling Kyiv, the capital, and also seized a nuclear power station. The exodus of Ukrainians exceeded 2.2m, making it the fastest-growing refugee surge in Europe since the second world war. More than 1.3m have entered Poland. Britain told refugees to apply for visas, and made it bureaucratically difficult for them to do so. The European Union is allowing all Ukrainians in for…