We cannot rule out any version of the crash of the Russian airliner in Egypt, Kremlin spokesman told journalists. "We cannot say what version of a possible cause of the crash will be a basis of the investigation," Dmitry Peskov said, replying to a question about whether a terrorist attack could be to blame. Russian President Vladimir Putin is constantly being briefed with information on the A-321 passenger jet that crashed on Egypt's Sinai Peninsula over the weekend, Kremlin spokesman Dmitry Peskov said Monday. "The volume of work completed has been huge, and the president has naturally been receiving all information on a constant basis of what has happened and what his happening right now," Peskov told journalists. Russian President Vladimir Putin will meet with Transport Minister Maxim Sokolov, who has just returned from Egypt, to receive the latest updates on the fatal crash of the A-321 passenger jet that crashed on Egypt's Sinai Peninsula. "The president will most likely meet for an hour with Transport Minister Sokolov, who is also heading the state committee on the plane. Early in the morning, Sokolov returned from Egypt and will give the president his report on the catastrophe," Peskov said. Russia has given Egypt's coordination efforts on the A-321 passenger crash over the Sinai Peninsula a high assessment as the Egyptian authorities are working effectively, Kremlin spokesman said Monday. "You know, Moscow assesses Egypt's level of coordination with the Russian side very highly, the Egyptian authorities are working effectively and providing full cooperation," Peskov told journalists. A Russian Kogalymavia Airbus A-321 passenger airliner, with 217 passengers and seven crew members on board, crashed in the Sinai Peninsula in Egypt on Saturday, leaving no survivors.