Belgium, which has voiced concern about Rwanda's support for rebels in the eastern Democratic Republic of Congo (DRC), has said it will respond in kind.
The number of small-boat migrants reaching Britain since Labour came to power is up by just over a quarter, after more than 600 arrived over the weekend.
The biggest increase came in the second half of the year - following the general election - when 61,383 asylum bids were lodged, compared with 50,352 during the same period in 2023.