Central European gas flows have adapted to the halt of Russian supplies through Ukraine on Jan. 1, as increased shipments to the region from Germany and Italy make up the shortfall, data from network operators showed on Monday.

The contract between Kyiv and Moscow for the transit of Russian gas expires January 1. This historic event is a source of tension, as Slovakia and Hungary, which are particularly dependent on Russian supplies,

The Urengoy-Pomary-Uzhgorod pipeline was built in the Soviet era to carry Siberian gas to European markets. It became the main conduit to Ukraine’s border with Slovakia from Siberia, passing through the town of Sudzha — which is now under the control of Ukrainian military forces — in Russia’s Kursk region.