A Russian oil tanker carrying 730,000 barrels of crude is steaming towards Cuba, spotlighting Moscow's defiance of US sanctions and the Kremlin's enduring spy presence on the island. The shipment underscores a high-stakes geopolitical gamble: Russia may be paying Havana with oil to preserve its Cold War-era signals intelligence facility near Havana, known as Lourdes. This base, reopened by Moscow in 2014 after a 25-year closure, bristles with antennae and eavesdropping equipment roughly 200 miles from Florida, home to key US military installations including Central Command and Cape Canaveral launchpads. Lourdes remains a thorn in Washington's side despite its perceived obsolescence, while Cuba's frail economy desperately needs the fuel. Russia has denied the tanker's destination, but analysts see the move as retaliation against US pressure and a lifeline for Havana.