U.S. President Joe Biden delivered a major address in Poland on Saturday, rallying support for Ukraine and calling for unity in the face of Russian aggression.
Ukraine's President Volodymyr Zelenskyy has urged energy-producing countries to increase their energy output, so "everyone in Russia understands that no one can use energy as blackmail."
It comes as countries across Europe and beyond seek to reduce their energy dependency on Russia — a major oil and gas producer and exporter.