Michele Kelemen

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Ukrainian President Petro Poroshenko met with President Trump at the White House on Tuesday, in what Poroshenko had earlier described as part of a "substantial visit" and the White House called a "drop-in."

Ukraine is concerned about what the Trump administration's efforts to improve relations with Russia might mean for its own relationship with Washington.

The White House didn't exactly roll out the red carpet for the Ukrainian leader — he dropped in to the Oval Office to see Trump following a meeting with Vice President Pence.

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