had planned to add new batch of Lekiu frigates but this was cancelled in August 2009. Complementing the two Lekiu frigates are two German-built Kasturi-class corvettes which were delivered in the early 1980s. Two Scorpène-class submarines were ordered by the RMN on 5 June 2002 under a €1.04 billion (about RM4.78 billion) contract to form the new submarine force. RMN also purchased six s and a batch of s to boost the fleet. In addition, the construction of six new also will make the RMN as a formidable power in the region. Anti-piracy efforts The Royal Malaysian Navy has been patrolling the Gulf of Aden to thwart piracy since 2009. In January 2011, the navy foiled a hijacking attempt against the Malaysian-flagged chemical tanker MT Bunga Laurel carrying lubricating oil and ethylene dichloride. The navy ship KA Bunga Mas 5 responded after receiving a distress signal from the ship. A Fennec attack helicopter was used to pin down the pirate mothership as commandos boarded the tanker. The commandos injured three pirates in the battle to re-take the ship. 23 sailors were rescued and seven Somali pirates were detained. According to an 11 February 2011 online breaking news update by CNN's Brad Lendon, the seven Somalis, including three boys under 15 years old, could face the death penalty if convicted on charges of firing on Malaysian armed forces- navy commandos- while attempting to hijack the ship. The seven was sentenced for four to seven years in prison by Malaysian High Court on 2 September 2013. The ship was rescued from the coast of Oman. The Royal Malaysian Navy was also involved in the operation to secure the release of that was hijacked in 2015 by a group of Indonesian pirates. All of the pirates were captured with the help of Vietnam Border Guard (VNBG), Vietnam Coast Guard (VNCG), Royal Australian Air Force and the Indonesian Navy. Sulu militants intrusion on Sabah Following the Sulu militants' intrusion, a military standoff lasted from 11 February 2013 until 24 March 2013 after 235 militants, most of whom were armed, arrived by boats in Lahad Datu, Sabah, Malaysia from Simunul island, Tawi-Tawi in the southern Philippines on 11 February 2013. The group, calling themselves the "Royal Security Forces of the Sultanate of Sulu and North Borneo", was sent by Jamalul Kiram III, one of the claimants to the throne of the Sultanate of Sulu. Kiram