Ukrainian President Volodymyr Zelensky made a brief visit to Greece on Monday, where Athens and Kyiv signed a significant agreement on natural gas cooperation aimed at strengthening Ukraine’s energy security amid ongoing Russian attacks on critical infrastructure.

According to Greece’s state news agency AMNA, the letter of intent signed between Greece’s DEPA Commercial and Ukraine’s national energy company Naftogaz will facilitate the transport of U.S.-sourced liquefied natural gas (LNG) to Ukraine. The deliveries will move through the “Vertical Corridor,” a regional gas network connecting Greece with Bulgaria, Romania and other Eastern European markets. LNG supplies under the agreement are expected to flow from December 2025 to March 2026, Xinhua news agency reported.

The signing ceremony took place in Athens in the presence of Greek Prime Minister Kyriakos Mitsotakis and President Zelensky. Mitsotakis said the agreement would provide Ukraine with “diversified and reliable energy sources,” noting that Greece has become an increasingly important transit hub for gas flows to Central and Eastern Europe.

On social media, Zelensky expressed gratitude for the deal, thanking Mitsotakis and the involved companies for supporting Ukraine’s efforts to secure stable energy supplies. “Such agreements are essential for our resilience and our ability to withstand daily attacks on our critical infrastructure,” he wrote.

Zelensky also thanked Greece and the United States for their role in supporting Ukraine’s energy sector and called for sustained international pressure on Russia. “Russia deserves further sanctions,” he said, praising Greece for backing Kyiv’s initiatives to secure the return of abducted Ukrainian children and prisoners of war.

Beyond the LNG agreement, discussions between Zelensky and Mitsotakis covered a wide range of issues, including Ukraine’s post-war reconstruction needs, strengthening bilateral defense cooperation, and Kyiv’s aspirations for deeper Euro-Atlantic integration.

The Greek government reaffirmed its commitment to Ukraine’s sovereignty and long-term stability, while Kyiv welcomed Athens’ continued diplomatic, military and humanitarian support.

Zelensky’s visit to Athens underscores the growing strategic role of Greece in Europe’s evolving energy landscape, as well as its political alignment with Ukraine as the war enters another winter.