Sign up now for FREE unlimited access to Reuters.com Register June 11 (Reuters) – Russian forces around Ukraine’s Sivierodonetsk have not advanced south of the city since Friday, the British Defense Ministry said on Saturday. “Intense street-to-street fighting is ongoing and both sides are likely to have heavy casualties,” the ministry said in a statement posted on Twitter. Sign up now for FREE unlimited access to Reuters.com Register Report by Shivani Tanna in Bengaluru. Edited by William Mallard Our role models: The Thomson Reuters Trust Principles.