This allows Russian oil firms to operate in Libya and do work for the Libyan national oil company. Russia and the Turks refuse to withdraw their troops from Libya until they receive guarantees that their interests in Libya are respected. In Libya the eastern faction proved very effective at controlling Islamic terrorist activities and gradually eliminating most of them. The EU support has also reduced the ability of people smuggling gangs to get illegal migrants into Libya and then into Europe by boat. Most of the fatalities among the illegal migrants occur at sea when overloaded smuggler boats sink and most of the people on board drown.