WASHINGTON (Reuters) - The United States plans to impose additional sanctions against North Korea very soon, a White House spokeswoman said on Wednesday after Pyongyang said it had it successfully tested a new intercontinental ballistic missile and could now reach the U.S. mainland with its nuclear weapons.  We re going to add additional sanctions very shortly that will continue to put that maximum pressure on North Korea,  White House spokeswoman Sarah Sanders told Fox News in an interview.  Sanders also said the administration would also  try to push Russia to take a bigger and bolder stance to put more pressure on North Korea.  
U.S. imposing more sanctions against N.Korea soon: White House