Angola agreed to trade oil to Slovakia in return for arms, buying six Sukhoi Su-17 attack aircraft on 3 April 2000. The Spanish government in the Canary Islands prevented a Ukrainian freighter from delivering 636 tons of military equipment to Angola on 24 February 2001. The captain of the ship had inaccurately reported his cargo, falsely claiming the ship carried automobile parts. The Angolan government admitted Simportex had purchased arms from Rosvooruzhenie, the Russian state-owned arms company, and acknowledged the captain might have violated Spanish law by misreporting his cargo, a common practice in arms smuggling to Angola.