The Ministry of Foreign Affairs of Ukraine announced today that Ukraine fulfilled its pledge to remove all HEU material from its territory that was made in advance of the 2010 Nuclear Security Summit. According to the statement, the HEU containing material was removed from the Kharkov Institute of Physics and Technology. The material was transferred to Russia. The removal of HEU was made possible by the GTRI program of the U.S. National Nuclear Security Administration.
UPDATE: According to Andrew Bieniawski, the director of GTRI, who was quoted by Reuters, the last shipment of HEU crossed the Ukraine-Russia border on March 25, 2012. It contained spent fuel of the research reactor in Kiev. The fuel is being transferred to Mayak.
UPDATE: NNSA published a photo set documenting the transfer.