By Simon Gardner, Zohra Bensemra and Abdelaziz Boumzar BUCHA, Ukraine (Reuters) – Dead civilians still lay scattered over the streets of the Ukrainian country town of Bucha on Saturday, three days after the invading Russian army pulled back from its abortive advance on Kyiv to the southeast. The smell of explosives still hung in the cold, dank air, mingling with the stench of death. Sixty-six-year-old Vasily, who gave no surname, looked at the sprawled remains of more than a dozen civilians dotted along the road outside his house, his face disfigured with grief. Residents said they had been ki…