The two have no diplomatic ties and their already tense relationship has been frayed by the crisis over the North 's nuclear ambitions .
The two have no diplomatic ties and their already tense relationship has been frayed further by a diplomatic spat over North Korea 's nuclear ambitions .
Freddie Mac shares were off $ 7.87 , or 13.2 percent , at $ 52 in midday trading on the New York Stock Exchange .