The claim uses specific details—such as the submarine passing a historic colonial fortress and sailors being visible on deck—that match the arrival of the Russian Yasen-M class submarine Kazan in Havana on June 12, 2024.
Reports from The Guardian, Business Insider, and AP News confirm that the Kazan, the frigate Admiral Gorshkov, and two support ships conducted a five-day official visit to Cuba from June 12 to June 17, 2024. The visit was a significant geopolitical event at the time, occurring amid tensions over the war in Ukraine, but it is not a current event.
Search results for May 2026 show no news of a Russian fleet arrival; instead, current headlines in Cuban media (such as Cubadebate) focus on other topics like hantavirus investigations and diplomatic declarations. The viral post appears to be a "re-skinning" of old breaking news to appear current, a common tactic for driving engagement on social media.
Source quality: Multiple reputable news sources (AP, Guardian, Business Insider) provide exact dates and details for the 2024 event that perfectly match the claim's description. Current 2026 news feeds from Cuba do not mention any such arrival.