Cuban President Miguel Diaz-Canel said on Thursday the Caribbean country will defend itself against any "terrorist and mercenary aggression that seeks to undermine its sovereignty and national stability".
His remarks on social media came after Havana said on Wednesday it had killed four exiles and wounded six others who sailed into Cuban waters aboard a Florida-registered speedboat on Wednesday and opened fire on a Cuban patrol.
The Cuban government said the group was comprised of anti-government Cubans, some of whom were previously wanted for plotting attacks.
"Cuba does not attack nor threaten," Diaz-Canel wrote on X. "We have stated this on repeated occasions and reaffirm it today: Cuba will defend itself with determination and firmness."
The incident took place at a time of heightened tensions, with the United States blocking oil shipments to the island.
The fuel shortages have hit transport and worsened power cuts on the Caribbean's largest island, where the electricity grid relies on imported oil.
The United Nations has warned of a humanitarian crisis if Cuba's energy needs are not met. (Reuters)
Edited by Aaron Tam
