U.S. will respond if Russia moves any military forces across Ukraine border -White House

If any Russian military forces move across Ukraine's border, they will be met with a "swift, severe, and united response" from the United States and its allies, White House press secretary Jen Psaki said in a statement on Wednesday.

She also said Russian aggression short of military action, including cyberattacks and paramilitary tactics, will be met with "a decisive, reciprocal, and united response."