Hungarian Prime Minister Viktor Orbán has congratulated US Republican presidential candidate Donald Trump on winning the elections despite the fact that official results are yet to be announced.

Hungarian Prime Minister Viktor Orban will host dozens of European leaders in Budapest later this week boosted by his "dear friend" Donald Trump's US election victory, but with relations with other EU states increasingly strained.

Europe will need to rethink its support of Ukraine if Donald Trump is elected president of the United States, Hungarian Prime Minister Viktor Orban said on Sunday, as the continent "will not be able to bear the burdens of the war alone".

Orban, who has grown increasingly isolated within the EU for his ties with Russia and opposition to military aid for Ukraine, has praised Trump as a "man of peace" who would quickly end the war. The two spoke by phone late on Wednesday, and Orban posted on social media: "We have big plans for the future".

Hungary PM Orban praises Donald Trump's 'comeback' in the U.S. election:::: Budapest, Hungary:: Viktor Orban, Hungarian Prime Minister:: “I see a shining victory, perhaps the biggest comeback of the history of western politics.