The Russian embassy in Washington delivered a diplomatic protest known as a démarche to the Department of State threatening “unpredictable consequences” unless the U.S. stops shipping advanced weapons to Ukraine. (https://www.rawstory.com/vladimir-putin-2657165030/) The Russian threat came on the heels of a warning by CIA Director William J. Burns that Putin might resort to the use of tactical nuclear weapons to counter his losses on the battlefield and now the high seas. “Given the potential desperation of President Putin and the Russian leadership, given the setbacks that they’ve faced so far, militarily, none of us can take lightly the threat posed by a potential resort to tactical nuclear weapons or low-yield nuclear weapons,” Burns said in answer to a question from former Sen. Sam Nunn of Georgia. Burns is a former ambassador to Russia who dealt directly with Putin while serving in Moscow and is the Biden administration official most familiar with his thinking.