The shipments most likely included fuel of Pamir reactor and Giatsint facility. Belarus also agreed to remove the remaining HEU (most likely fuel of the IRT-M research reactor) by 2012.
UPDATE: Bellona reports that the November 29, 2010 shipment involved spent fuel of the IRT-M reactor with the total weight of 41 kg.
UPDATE: An account of the shipment as presented at the 2011 RERTR meeting:
Shipment of HEU Fuel from Pamir Reactor in Belarus to Russia and Conversion to High Density LEU Fuel, S. Sikorin, S. Mandzik, S. Polazau, T. Hryharovich, S. Alelekseev, Sh. T. Tukhvatulin, E. Dyakov, I. Daragan, I. Bolshinsky, Y. Gohar, J. Thomas