Japan donated over 10,000 ballot boxes for Cambodia's 2018 election on Wednesday, the first international aid for the vote after the European Union and United States withdrew their support following the dissolution of the main opposition party.

Rights groups and members of the dissolved Cambodia National Rescue Party (CNRP) have urged foreign backers, including Japan, to halt funding for Cambodia's National Election Committee (NEC) following a Supreme Court decision to dissolve the CNRP at the government's request.

But last month Japan, which is among the largest funders of Cambodia's elections, said it would continue to provide electoral aid in the lead up to Senate elections this month and a general election in July.