The UK has announced it is withholding £21 million of aid to Rwanda, due next month.
The UK says it is concerned it is supporting rebels in the DRC. Consecutive UK Prime Ministers have praised Rwanda's leadership.
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More than 1.85 million people have called for the US president's visit to be watered down to avoid causing "embarrassment" to the Queen.
Jim Mattis arrived in Baghdad on the day after US-backed Iraqi forces launched an operation to reclaim Mosul from IS.
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