At least one pair of newcomers said they left India out of fear of being deported to Myanmar.
Ex-political prisoner Meach Sovannara says the Cambodia National Rescue Party will remain united despite a crackdown by the ruling party.
Former CNRP members barred from politics may not take part, Cambodian authorities say.
Chen Wuquan is handed the sentence after helping local people protest against a planned land reclamation project.
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