There was no immediate comment from SOCAR, which operates around 60 fuel stations across Ukraine, or Azerbaijani officials. Russia has not publicly commented on the matter. Ukraine's energy minister told reporters in Kyiv it was "hard to assess the damage" and said rescue crews were still at work.

Kyiv pitches weapons purchases and joint production to lock in American security commitments as US President Donald Trump pushes Putin-Zelenskyy trilateral talks

Territorial questions are certain to be a key area of focus when Ukrainian President Volodymyr Zelenskiy and European leaders meet U.S. President Donald Trump for talks on Monday to map out a possible peace deal to end Russia's war in Ukraine.

"This latest strike against our energy security is outrageous and unacceptable!" Hungarian Foreign Minister Péter Szijjártó posted to X on Monday morning.

Russia’s illegal seizure of the Crimean Peninsula from Ukraine in March 2014 was quick and bloodless, and it sent Moscow’s relations with the West into a downward spiral unseen since the Cold War.

One of the obstacles for Monday’s meeting between Presidents Donald Trump and Volodymyr Zelenskyy will likely be what Trump has called “land swaps,” though all of the land in question belongs to Ukraine.