A Pair of Cuba-Destined Relief Ships Listed Missing after Departing Mexican Waters.

A large-scale search and rescue operation is actively under way in the Caribbean Sea for a pair of missing sailing vessels carrying humanitarian supplies en route from Mexico to Havana.

Naval Search and Rescue Operations Deployed

The Mexican government has sent naval teams and military search aircraft to search for the two vessels, which were had on board a minimum of nine total sailors, per a navy statement.

The vessels had been scheduled to make landfall in the Cuban capital on either Tuesday or Wednesday, but there has been a complete lack of contact from them and no official word of their docking, the statement clarified.

Context of Aid to the Nation

Cuba has depended significantly on Mexico's over recent weeks, as the island struggles through repeated national electricity failures.

"Both skippers and their teams are seasoned mariners, and the two ships are outfitted with suitable safety equipment and communication devices," a representative for the convoy said.

The nine crew members are nationals of the United States, Cuba, France, and Poland. Mexico said it has been in touch with maritime rescue coordination centres from the involved countries along with their diplomatic representatives.

"We are collaborating completely with the officials and continue to be hopeful in the crews' ability to reach Havana safely," the spokesperson added.

Previous Relief Shipment

Earlier in the week, the government in Havana publicly celebrated and officially received a separate vessel that had delivered a significant amount of humanitarian aid to the nation.

That boat, dubbed "a new Granma" following the name of the yacht in which Fidel Castro came back to Cuba to begin the Cuban Revolution in the 1950s, carried solar equipment, drugs, infant formula, bikes and food.

Wider Geopolitical Climate

Non-governmental organizations and volunteers have been at the forefront of efforts to ship humanitarian aid to Cuba since January, when a fuel embargo on the Communist-run nation began.

International organizations have since warned of ""severe" supply shortages, with more than 50k surgeries cancelled in Cuba due to electricity supply constraints.

Political measures have been ramped up in recent months, with comments from several leaders highlighting the delicate nature of relations.

Reacting to recent statements, a senior Cuban official insisted that "the political system of Cuba is non-negotiable."

Reports suggest that initial phases of negotiations had begun, although their current progress remains unclear.

The Mexican navy said it was pledged to using every available asset at its disposal to discover the boats and ensure the well-being of the people on board.

As of now, there has been no public statement on the missing boats by the Cuban leadership.