Russian advances across Ukraine have slowed in recent days amid mounting casualties, but attempts to encircle and cut off the capital Kyiv continue. Here are the latest developments on day 21 of the invasion: Kyiv's suburbs saw some heavy aerial bombardment overnight Russian naval forces are gathering on the Black Sea near Odesa But supporting troops around Mykolaiv remain bogged down Siege of Mariupol continues after 20,000 were evacuated