Surveillance planes are being deployed in the Horn of Africa amid growing signs of a new offensive in the war on terrorism.
Britain is deploying two of the planes in Kenya.
They will be based in the port of Mombasa.
Western warships have already been on anti-terror patrols in the region to ensure senior terror leaders do not slip into Somalia.
Kenya shares a long border with Somalia.
The Muslim country has effectively been without a government since the start of a civil war in 1991.