By Vitalii Hnidyi BALAKLIIA, Ukraine (Reuters) – Joy, trepidation and grief flickered across the face of Nataliia Yelistratova as she sat next to her husband on a special train back to their home town of Balakliia that Ukraine recaptured last week after six months of Russian occupation. The town – which had a population of 27,000 before the war – is one of key urban outposts that Ukraine recaptured in northeastern Kharkiv region in early September after a sudden collapse of one of Russia’s principal front lines. Smiling, Yelistratova said: “The weather is great because we’re going home. My moo…