Also Wednesday, U.S.-backed Angolan rebels fighting the Marxist government said they captured a town on the Benguela railroad, the principal route for transporting minerals from Zaire, Zambia and eastern Angola to the Atlantic Ocean port of Lobito.
Lobito is the starting point of the Benguela railroad but rebel attacks have made it impossible for trains to travel as far as Cuemba.
Dos Santos did not disclose details of the plan other than to say it includes a "peace zone" along the Benguela railroad, Lusa reported.
There was no independent confirmation of the claims, but the Angolan state news agency said 10 rebels died in clashes in central Huambo, Cuanza South and Benguela provinces last week.
Since early March, about 5,000 Cuban troops have been sent to the western Angolan city of Benguela, the officials said.
In a separate statement released earlier in Lisbon, the rebels claimed their forces killed 41 government fighters in a two other battles in Benguela and Bie on Jan. 18 and 19. The rebels suffered one dead and four wounded, the statement said.