Greenpeace activists on Saturday prevented a tanker carrying Russian liquefied natural gas (LNG) from unloading its cargo at the port of Tornio.
The tanker belongs Finnish state-owned Gasum.
"Greenpeace activists in kayaks are in the water to prevent the ship from docking and climbers have occupied the cranes that would unload the gas from the ship," the group said in a statement on Saturday.
Greenpeace Nordic said it wants the Finnish government to stop the import of Russian fossil gas.
"It's completely unacceptable that Russian fossil gas is still allowed to flow into Finland, more than six months after Putin began his invasion of Ukraine. The Finnish government and Prime Minister Sanna Marin have to ban all Russian fossil fuel imports immediately. The state-owned company Gasum should not be allowed to continue funding the war in Ukraine," Olli Tiainen of Greenpeace Nordic said in the organisation's release.
Gasum meanwhile said it follows current rules, according to the company's spokesperson, Olga Väisänen.
"At the moment there are no restrictions on gas imports, neither in the EU nor in other countries where Gasum operates," she explained, adding that Gasum has a long-term contract with Russia's Gazprom Export.
"It's a 'take or pay' deal. This means that in any event we have to pick up the minimum delivery. If we don't, we still have to pay for it," Väisänen explained.
She told Yle that the majority of Gasum's liquified natural gas is sourced from countries other than Russia. "We have a long-term contract with a liquefaction facility in Norway and we load gas from central European terminals."
Earlier this month Finnish and Swedish Greenpeace activists stopped a Dutch tanker carrying Russian fossil gas from unloading its cargo at an LNG terminal in Nynäshamn, south of Stockholm.