U.S. President-elect Donald Trump is “strong and unpredictable,” and those qualities can be a decisive factor in his policy approach to Russia’s invasion of Ukraine, according to Ukrainian President Volodymyr Zelenskyy.

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.