Ukrainian soldiers clear up tanks and artillery from recently-vacated Russian positions near the key city of Izyum in the Donbas region. One unnamed Ukrainian soldier says they've recovered "lots of ammunition for tanks, for artillery" abandoned by retreating Russian soldiers, which the soldier says the Ukrainians "actually plan to send all this ammunition back to them as a gift." On Sunday, Ukraine claimed it has retaken more than 3,000 square kilometres (1,158 square miles) of terrain in a second, lightning counter-offensive around Kharkiv in the northeast which appeared to catch Russia off guard. EXCLUSIVE IMAGES AND SOUNDBITES