1.   Ties have soured over the past two years owing to disputes involving immigration, drugs, fishing rights and the Western Sahara.

2.   Turkish-Iranian ties soured last year when the Iranian ambassador in Ankara attended a rally advocating an Islamic regime in secular Turkey.

3.   Ties had soured over the past two years owing to disputes involving immigration, drugs and fishing rights.

4.   Ties have soured recently between the Southeast Asian neighbors.

5.   Despite the long-awaited passage of the trade agreement, Vietnam-US ties have soured in recent months over disputes over human rights.

6.   Ties soured further in March when Amman allowed US planes to launch surveillance flights of a no fly zone in southern Iraq from Jordanian territory.

7.   Ties have soured since Iran was cut out of an international consortium to exploit Azerbaijani oil reserves on the Caspian Sea in April.