MOSCOW — Russia is working to re-establish its former military bases in Vietnam and Cuba, a senior official said on Friday, reflecting Moscow’s growing ambition to reassert itself on the world stage.

The official, Deputy Defense Minister Nikolai A. Pankov, spoke at the national Parliament shortly before lawmakers voted to ratify an agreement with Syria to make the Russian military presence there permanent.

Russia lowered its flags at the Cam Ranh Bay naval base in Vietnam and at the Lourdes signal intelligence station in Cuba in 2002, when it scaled back its military presence around the world for budgetary and other reasons.

“We are re-rethinking the decisions that were made earlier,” Mr. Pankov said, without giving any details.