Pentagon officials have in recent weeks asked several NATO countries to tone down their rhetoric regarding the threat posed by Russia, arguing that some statements by European leaders and officials have undermined continental security, four people familiar with the matter said. Among the nations that have received messages urging them to keep public statements in check are Lithuania, Latvia and Estonia, said the people, who spoke on condition of anonymity. It was not clear if the messages, which were delivered in bilateral meetings, were conveyed to other European governments. Among the comments that have drawn US officials' attention are suggestions...