Countryman on the West’s economic sanctions against Russia

The Lithuania Tribune / EN.DELFI TV spoke to Mr Thomas Countryman, Assistant Secretary, from the U.S. Department of State, Bureau of International Security and Nonproliferation. Donald Tusk, the President of the European Council recently stated at the G7‘"So let me state clearly given the current situation, if any one wants to start a discussion about changing the sanctions regime, it could only be about strengthening it." What is the US position on this Assistant Secretary Countryman?