The 20 hour siege of Moscow University tanker by Somali pirates armed with grenade launchers and high-caliber weapons was broken yesterday as Russian special forces decided to take back the ship by force. With 23 crew members on board, the Moscow University tanker with 86,000 tons of oil was hijacked by Somali pirates on Wednesday around 04:00 GMT, when it was on its way from the Red Sea to China. It was hijacked 350 miles east of the Gulf of Aden. The crew members locked themselves in a safe room after successfully disabling the ship. The captain of the ship meanwhile got into touch with a Russian warship in the area and radioed for backup. The Marshal Shaposhnikov, with two helicopters and an infantry unit on board, responded.