Russian advances have ground to a halt in many areas, with Ukrainian forces holding out in several cities and also launching effective counterattacks. Here are the latest developments on day 24 of the invasion: Fighting taking place on streets in the centre of Mariupol Russian forces agree to allow residents to evacuate several cities in the east Ukrainian forces holding on to Kharkiv and repel an advance to the south of the city Russian naval forces remain off the coast of Odesa in the Black Sea Russia launched its attack in the early hours of 24 February, but more than three weeks into the war its forces have failed to build on initial gains they made across the country. "The Russians are making almost every tactical mistake it is possible to make," according to Prof Michael Clarke, former director of the Royal United Services Institute (Rusi) think tank. The ferocity of the Ukrainian resistance has meant Russian forces have been forced to change their ap...