welcome back to "up." new this morning, president putin suspends a key nuclear treaty with the u.n. that decision just hours after the u.s. withdraw from the inter-mead dwrat range nuclear forces treatsy saying russia violated that packet. >> russia has jeopardy sized the united states security interest. >> president putin says his country will not deploy any weapons unless the u.s. does first, but all of this has sparked fears in an arms race when lawmakers of both parties have criticized the foreign policy decisions. >> the treaty has been a dead