The International Court of Justice in The Hague is hearing a case brought by Ukraine against Russia, accusing Moscow of illegally annexing Crimea and illicitly funding separatist rebels.
Ukraine is seeking compensation for what it describes as terrorist acts committed on its soil.
They include the shooting down in 2014 of Malaysia Airlines Flight MH17, which killed all 298 people on board.
Russia has repeatedly denied sending troops or weapons to eastern Ukraine.
It also denies bringing down MH17.
However the US military has said thousands of Russian troops have been operating in eastern Ukraine since the beginning of the crisis.
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