(Reuters) – The United States will reopen its embassy in Ukraine soon, its top diplomat said on Monday after he and the U.S. defense secretary visited Kyiv, promising more military aid and hailing the fight against Russia’s invasion. FIGHTING The following reports could not be immediately verified by Reuters: * One railway worker was killed and four injured by Russian missile strikes on five Ukrainian railway stations on Monday, the head of Ukraine’s state railway company said. * Russia said it had hit 56 Ukrainian military infrastructure facilities overnight. * Ukraine’s general staff said Ru…