Russian state-controlled gas giant Gazprom is making the assumption that no more gas will flow to Europe via Ukraine after Dec. 31 in its internal planning for 2025, a person familiar with the plans said.

The russian company Gazprom has prepared to stop natural gas transit through Ukraine.This is stated in the company's plan for 2025, Reuters reported, citing

Kyiv has indicated it will not extend the transit deal, ending over 50 years of gas flows from Siberia to central Europe — a vital revenue stream for Russia since the Soviet era.

Russian gas exports to Europe through Ukraine have been stable on Monday despite a contractual row between Kremlin-owned Gazprom and Austria's OMV , which halted gas flows to the Vienna-based company this month.