stsb sentence1: russian president vladimir putin states that the decision to cease implementation of the conventional forces in europe treaty is a response to u.s. plans to establish missile defense sites in eastern europe and to nato's failure to ratify an amended version of the treaty. sentence2: russian president vladimir putin states that the decision is a response to u.s. plans to establish missile defense sites in eastern europe and to nato's failure to ratify an amended version of the treaty.