dire economic consequences if russia invades ukraine. president putin apparently replied, that would be a colossal mistake. for now, both sides have agreed to keep talking. cnn's nick rob robertson has th latest. >> reporter: a kremlin spokesman said that the russian side was happy with the way that the call had gone, that the conversations were serious, they were constructive, he said that they felt that president biden had showed a willingness to understand the essence of russia's security proposals, that is, that ukraine cannot become a member of nato and that nato cannot put its troops or military hardware inside of ukraine. russia saying they feel like that message has landed. bau kremlin spokesman saying that putin was very clear that he understood the message from president biden that if russia doesn't de-escalate tensions at the moment, there could be serious economic, financial, and