Kyiv imposes a thirty-five hour curfew as Russia continues its attacks

President Volodomyr Zelensky of Ukraine has thanked the prime ministers of Poland, the Czech Republic and Slovenia for travelling to Kyiv to meet him - despite the continuing bombardment by Russian forces. Also: Nato has convened an emergency meeting next week, and the dangers facing those who are trying to escape the besieged southern port of Mariupol.