Ukrainian forces have advanced north from Kharkiv to within 30 miles (48km) of the border with Russia and are also pressing to the south and east in the same region, Ukraine's commander-in-chief of the armed forces, Gen Valeriy Zaluzhnyi, said on Sunday.

Ukrainian forces are continuing to make rapid advances in the northeast of the country, reclaiming more than a third of the occupied Kharkiv region in three days. Much of Ukraine’s territorial gains were confirmed by Russia’s defence ministry on Saturday.