The author of a Khmer Rouge memoir who now lives in the US is raising funds to help education in Cambodia.
Authorities say they are concerned infected pigs are being smuggled in from Thailand and Vietnam.
Hun Sen said the courts had made an independent decision free of political influence.
Duch, whose real name is Kaing Kek Iev, faces the prospect of release at the age of 86.
Following last week's verdict of Duch, 24 of 90 victims who claimed they lost loved ones in his torture center were dismissed.
Trade volume between the two increased more than 120 percent in the first quarter of the year compared to the same period last year.
The decree also follows a 2006 law that provides for military conscription.
On Monday, officials began blood tests of pigs in Kampot, where the latest and most severe outbreak has occurred.
Thirty-seven countries have ratified the 2008 Convention on Cluster Munitions.
Following Duch’s verdict and sentencing, issued Monday, the EU immediately announced a contribution of $2.6 million to the tribunal.
Preah Vihear temple remains at the center of an ongoing border dispute between Cambodia and Thailand.
Thailand has re-raised objections to the World Heritage status of Preah Vihear temple on the northern border.