Washington (AFP) – Ukraine should not fixate on defending the city of Bakhmut at all costs and instead use a window of opportunity to prepare a major counter-offensive against Russian forces, a senior US official said Friday. That industrial hub has become the epicenter of the grinding war in eastern Ukraine, involving mass artillery strikes, slow advances and high casualties for both sides. Bakhmut has also turned into a key political and symbolic prize, with Ukrainian President Volodymyr Zelensky visiting the frontlines there in December, right before his dramatic trip to address the US Congress in Washington. However, a senior...