Mr Obama has said he will offer US support as Kiev tries to settle a gas bill with Russian supplier Gazprom, which has threatened to cut supply, APA reports quoting BBC News.
Ukraine's struggling economy has been in recession since 2012.
Mr Obama is in Poland for celebrations marking the 25th anniversary of the end of communism there.
But his visit has taken on extra significance following Russia's annexation of the Crimean peninsula in March. The move has left East-West relations at their lowest ebb since the Cold War.
Mr Obama is seeking to reassure East European allies that Washington will support them in the event of any Russian "provocation".
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