Recent days have seen Kyiv hit targets deeper in Russia than ever before, striking sites in Saint Petersburg, home town of Russian President Vladimir Putin . Ukraine's President Volodymyr Zelenskyy challenged Putin to end the war in an open letter and called for a face-to-face meeting with the Russian leader. Zelenskyy also held a meeting with British Prime Minister Keir Starmer and the leaders of France and Germany in London, apparently drumming up support for Ukraine's war effort.  DW asked