By Vitalii Hnidyi STARYI SALTIV, Ukraine (Reuters) – Ukrainian volunteer Vitalii Kivirenko loads a small rowing boat with tins of food and supplies by the village of Staryi Saltiv, on the Pechenizhske Reservoir, northeast of Kharkiv, ready to make a short trip that was unthinkable just a few weeks ago. After Ukrainian forces pushed Russian troops back from the eastern banks of the reservoir, opposite Staryi Saltiv, in a counter offensive earlier this month, volunteers and relatives can finally reach those in isolated villages on the other side, and some of those who fled are returning home. Ro…