In 2009, Russian natural gas company Gazprom refused to conclude a supply contract unless Ukrainian gas company Naftogaz paid its accumulating debts for previous gas supplies. The dispute began in the closing weeks of 2008 with a series of failed negotiations, and on January 1, 2009 Russia cut off gas supplies to Ukraine. On January 7 the dispute turned to crisis when all Russian gas flows through Ukraine were halted for 13 days, completely cutting off supplies to Southeastern Europe, most of which depends on Russian gas, and partially to other European countries.

PJSC Gazprom is a Russian majority state-owned multinational energy corporation headquartered in the Lakhta Center in Saint Petersburg. As of 2019, with sales over $120 billion, it was, until 2023, ranked as the largest publicly listed natural gas company in the world and the largest company in Russia by revenue. In the 2020 Forbes Global 2000, Gazprom was ranked as the 32nd largest public company in the world. The Gazprom name is a contraction of the Russian words gazovaya promyshlennost. In January 2022, Gazprom displaced Sberbank from the first place in the list of the largest companies in Russia by market capitalization. In 2022, the company's revenue amounted to 8 trillion rubles. In 2023, the company is delisted from international markets, and continues substantial constriction in its operational results.