The war between Russia and Ukraine appears to be entering a new phase after Kyiv dealt a big blow to Moscow's grip on parts of the east with a fast-moving offensive that saw Ukrainian troops enter the strategic city of Izium after six months of occupation. Russian forces were forced to evacuate the strategic eastern city just five days after Ukrainian forces began a new offensive eastward through the Kharkiv region. The last five days have seen the most ambitious ground assaults by the Ukrainians since Russia launched its full-scale invasion in late February.