More than 15,000 Montagnards live in North Carolina.
The petitions were filed with the Inter-Parliamentary Union, the UN Human Rights Committee, CEDAW committee, and the UN human rights rapporteur on Cambodia.
The document shows that the party intends to move closer to China while remaining on high alert for any attempt by foreign governments to agitate for a popular uprising.
Prime Minister Hun Sen has congratulated the Koreas on holding joint Winter Games, welcoming the move as a step towards peace.
The amendments include restrictions on freedom of association and political participation, as well as restrictions on criticism of the monarchy.
Cambodia’s economic growth is forecast to remain stable at just short of seven percent in 2018, according to the World Bank.
The first vote after government crackdown on pro-democracy voices draws scant attention but without them, some say Cambodia will become a ‘totalitarian country’.
Deal between two nations under which hundreds of Cambodians were sent back from the US since 2002 fell apart last year when Phnom Penh reportedly stopped accepting returnees.
Voting is due to take place on February 25 and the NEC has estimated the cost of the vote to be about $2 million.
Hong Lim told VOA Khmer that he saw Prime Minister Hun Sen as “the same as Pol Pot”, the leader of the Khmer Rouge regime.
Two suspects have since been charged with premeditated murder over the shootings: Keut Veha and Phal Penh.
Tep Vanny was accused of assaulting security officers at a protest outside Prime Minister Hun Sen’s house in Phnom Penh in March 2013,