The UK has stopped £21m worth of aid to Rwanda, over its alleged support for rebels fighting the army of the Democratic Republic of Congo.
International Development Secretary Justine Greening said she stopped the payment to Kigali because President Paul Kagame has broken agreements.
Greening said that the evidence gathered by DfID "constitutes a breach of the partnership principles set out in the memorandum of understanding [between Britain and Rwanda], and as a result I have decided not to release the next payment of budget support to Rwanda".
"We are committed to finding lasting solutions to the conflict in this region and will work with the governments of Rwanda and DRC to secure a peaceful resolution to the situation in eastern DRC," she said.