Head of the Russian Air Force, Colonel-General Viktor Bondarev has ordered the grounding of the country’s entire Su-27 fleet, until the reasons behind the crash that led to a pilot’s death on Thursday are clear, the TASS news agency reported. The Defense Ministry confirmed that the jet crashed while returning to the airbase after a planned flight. Six jets from the Russian Knights squad took part in the opening ceremony of a monument dedicated to Russian aviators in the village of Anushkino earlier on Thursday. Only five of them returned to the airbase, TASS reported.