Three Russian warships arrived in Cuban waters on Saturday, Moscow’s second such maritime voyage in as many months in a reflection of deepening ties between Russia and Cuba.

The naval group, consisting of a training ship, patrol frigate and refueling tanker, are expected to remain docked in Cuba’s port of Havana until August 30. The arrival of the vessels comes mere weeks after another squadron of Russian warships, including a powerful nuclear-powered submarine, visited Havana as part of planned military exercises last month.