Washington (AFP) – The United States and Germany on Thursday warned Russia that a major gas pipeline was at stake if it invades Ukraine, as Washington voiced hope for a diplomatic way out despite frigid statements from Moscow. A day after the United States and its allies formally responded to security demands issued by Russia, top officials in Moscow said their chief concerns were not addressed but notably did not rule out new talks. The United States has warned Russia of swift and severe consequences if it invades Ukraine after Moscow amassed tens of thousands of troops on the border with its…