In 1978 MiG-23 aircraft were sent to Cuba, which caused concern in the USA.
"The Carter Administration denounced yesterday that Cuba has received an undetermined number of Soviet fighter planes, of which it is unknown whether they can transport and launch nuclear bombs. A spokesperson for the State Department confirmed that these planes appear to be the sophisticated Mig-23 and that The United States is currently analyzing whether the shipment of these planes violates the Soviet-North American understanding of 1962, which put an end to the so-called "missile crisis."..."
https://elpais.com/diario/1978/11/17/internacional/280105219_850215.html
"The Carter Administration denounced yesterday that Cuba has received an undetermined number of Soviet fighter planes, of which it is unknown whether they can transport and launch nuclear bombs. A spokesperson for the State Department confirmed that these planes appear to be the sophisticated Mig-23 and that The United States is currently analyzing whether the shipment of these planes violates the Soviet-North American understanding of 1962, which put an end to the so-called "missile crisis."..."
https://elpais.com/diario/1978/11/17/internacional/280105219_850215.html