NEW : President Obama sends Russia a letter addressing the matter . U.S. believes Russia has tested cruise missiles not allowed by 1987 treaty . The United States accused Russia on Monday of violating the 1987 Intermediate-Range Nuclear Forces Treaty , citing cruise missile tests that date to 2008 , senior State Department and White House officials said . Moscow says it investigated and considers the matter closed . Source tells CNN that Washington has proposed senior - level talks with Moscow .
NEW : President Obama sends Russia a letter addressing the matter . U.S. believes Russia has tested cruise missiles not allowed by 1987 treaty . Moscow says it investigated and considers the matter closed . Source tells CNN that Washington has proposed senior - level talks with Moscow .