Two Separate Cuba-Headed Humanitarian Vessels Listed Unaccounted For after Departing Mexican Waters.

A extensive search and rescue mission is presently in progress in the Caribbean region for a pair of unlocated boats carrying aid cargo journeying from Mexico to the island of Cuba.

Military Search Efforts Deployed

Authorities in Mexico has sent naval teams and military search aircraft to search for the two vessels, which were transporting a minimum of nine total crew members, according to a military release.

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

Context of Humanitarian Support to the Island

The Caribbean nation has leaned on Mexico's over the last several weeks, as the country endures widespread nationwide blackouts.

"The skippers and their teams are experienced sailors, and the two ships are equipped with appropriate navigational gear and communication devices," a spokesperson for the convoy said.

The nine crew members are from France, Poland, the United States, and Cuba. Mexico said it has opened communications with maritime rescue coordination centres from the involved countries along with their embassy officials.

"The group is co-operating fully with the relevant authorities and are still optimistic in the ability of the crews to safely arrive in Havana," the official further stated.

Previous Aid Mission

Just days before, the government in Havana widely celebrated and greeted with fanfare another boat that had carried a significant amount of humanitarian aid to the country.

That boat, nicknamed "a modern Granma" after the vessel in which Castro returned to Cuba to start the Cuban Revolution in the mid-20th century, brought solar panels, pharmaceuticals, formula milk, bicycles and foodstuffs.

Broader Geopolitical Backdrop

Non-governmental organizations and volunteers have primarily led attempts to deliver humanitarian aid to Cuba since January, a period which saw a fuel embargo on the island nation came into effect.

The United Nations have since raised alarms about "dire" supply shortages, with more than 50,000 surgeries called off in Cuba due to energy rationing.

Foreign policy pressure have intensified over the past months, with statements from different officials highlighting the delicate situation regarding diplomatic ties.

Reacting to certain proposals, a high-ranking government figure stated firmly that "the socialist system of Cuba is not up for negotiation."

Accounts suggest that initial phases of talks had begun, although their present status remains uncertain.

The Mexican navy said it was pledged to using all of the resources at its disposal to discover the boats and ensure the safety of the crews.

To date, there has been no public statement on the missing boats by the Cuban government.