Shortly after President Obama’s announcement of new US sanctions, Russia retaliated by introducing an entry ban in respect of the nine senior US government officials. This is stated to have been in response to the US designation of Russian officials on 17 March. U.S. Sen. John McCain U.S. Sen. Daniel Coats U.S. House Speaker John Boehner U.S. Deputy National Security Advisor Caroline Atkinson U.S. Presidential Aide Daniel Pfeiffer U.S. Deputy National Security Advisor Ben…