Why did Rwanda cut diplomatic ties to Belgium?

Rwanda has accused Belgium of undermining it constantly and cut diplomatic ties. Brussels is leading calls for the European Union to sanction Kigali over its support for the rebel group at the centre of crisis in DR Congo — the M23. Josey Mahachi talks to Fredrick Golooba Mutebi, a researcher on the Great Lakes region and DW's correspondent Nasra Bishumba in Rwanda.