NEW YORK —  Former New York City Mayor Rudy Giuliani is offering his expertise to a candidate for mayor of Kiev, Ukraine.

The ex-mayor's firm, Giuliani Partners, announced Wednesday that it is advising the campaign of Vitali Klitschko in the May 25 election.

Klitschko is a former heavyweight boxing champion who is running against the incumbent mayor of Kiev, Oleksandr Omelchenk.

Giuliani said his firm will advise the candidate on how to turn Kiev around by reforming city government.

Kiev is the capital of Ukraine and has 2.7 million people.

Giuliani failed in his own campaign for the Republican nomination for president. He has endorsed Sen. John McCain.