From my understanding, this news isn't announcement of a cure or vaccine, it's just an initiative that the Cuban government undertook to increase prenatal care and testing for pregnant women and their partners. As well as providing antiretroviral drugs, which dramatically reduces mother to child transmission of those diseases, they have made this achievement.
Any country is capable of acheiving this when they do what Cuba did. Still, interesting news out of Cuba and good that it's actually endorsed by the WHO.