The Indonesian navy has begun deploying ships to the country's southern waters in efforts to stem the flow of asylum seekers to Australia.
A spokesman for the Indonesian Defence Ministry confirmed on Monday that the deployment was already under way and would include vessels capable of being at sea for extended periods.
It follows talks in Jakarta last week between Australian Foreign Minister Bob Carr and his Indonesian counterpart Marty Natalegawa.
Prior to that meeting, a high-ranking officer with the Indonesian navy revealed plans to boost patrols in the Sunda Strait, between Java and Sumatra.
The strait has become the main thoroughfare used by people smugglers sending boats from Indonesia to Christmas Island.