Passage: At 1:00 pm EDT on October 26, John A. Scali of ABC News had lunch with Aleksandr Fomin, the cover name of Alexander Feklisov, the KGB station chief in Washington, at Fomin's request. Following the instructions of the Politburo of the CPSU, Fomin noted, "War seems about to break out." He asked Scali to use his contacts to talk to his "high-level friends" at the State Department to see if the US would be interested in a diplomatic solution. He suggested that the language of the deal would contain an assurance from the Soviet Union to remove the weapons under UN supervision and that Castro would publicly announce that he would not accept such weapons again in exchange for a public statement by the US that it would avoid invading Cuba. The US responded by asking the Brazilian government to pass a message to Castro that the US would be "unlikely to invade" if the missiles were removed.

Question: What did the US want Castro to remove to make invading unlikely?
missiles