LONDON (Reuters) -A former British soldier has been killed fighting for Ukraine in the city of Sievierodonetsk, his family said on social media, and a senior Ukrainian official praised him as a “true hero”. Jordan Gatley left the British Army in March, his family said, and went to Ukraine to help in the fight against the Russian invasion. The family said it had received the news on Friday that he had been shot and killed. The eastern city is the epicentre of intense fighting to control the country’s Donbas region. “He loved his job and we are so proud of him,” his family said in a Facebook pos…