Such sanctions would prohibit Gazprom from paying Ukraine transit fees, which analysts say could end Russian gas flows to Europe via the country.
"(Sanctions) would make into reality the worst-case scenario that European governments have been preparing for all summer, a European gas market without Russian gas," said Natasha Fielding, head of EMEA gas pricing at Argus Media.
"Transit through Ukraine is the only Russian gas delivery route to Europe still in use besides the Turkish Stream pipeline, which serves southeast European countries," she added.
Gas flows via the only operational Ukraine transit route through Sudzha are currently around 42 million cubic metres a day.
As a result, European gas storage was 88% full as of Sept. 26, although there are variations between countries.