Letter written to Comrade Carlos C. Brisuela, a representative of the Cuban government. Two annexes are attached. These state that the USSR will provide to Cuba (in addition to the materials provided by the 30 Sept. 1961 agreement) the materials as specified in Annex I. Apart from the provision provided by Annex I, the USSR will provide materials in accordance with Annex II. In all other affairs, the parties are guided by the original Sept. 1961 agreement.