Hungary's nationalist Prime Minister Viktor Orban is due to meet his ally Donald Trump in Washington on Friday, for the first time since the American president's re-election, as he seeks a waiver on US sanctions on Russian oil.

The United States hit Russia's two biggest oil producers with sanctions last month, the first such measures targeting Moscow since Trump returned to the White House, in a bid to end the war in Ukraine.

Hungary -- the closest ally in the European Union of both Trump and the Kremlin -- depends heavily on Russian oil and gas despite EU efforts to wean itself off.

Orban -- who will be accompanied by a large delegation, including six ministers -- has said he would seek a sanctions waiver on Russian energy, deeming Trump made a mistake "from the Hungarian point of view

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