U.S. has sent backchannel warnings to Russia against using nuclear weapon - The Washington Post

U.S. has sent backchannel warnings to Russia against using nuclear weapon - The Washington Post: The%20attempt%20by%20the%20White%20House%20to%20cultivate%20what%u2019s%20known%20in%20the%20nuclear%20deterrence%20world%20as%20%u201Cstrategic%20ambiguity%u201D%20comes%20as%20Russia%20continues%20to%20escalate%20its%20rhetoric%20about%20possible%20nuclear%20weapons%20use%20amid%20a%20domestic%20mobilization%20aimed%20at%20stanching%20Russian%20military%20losses%20in%20eastern%20Ukraine.%0A