The US president Barack Obama and German chancellor Angela Merkel have warned Russia it will face new sanctions if it interferes in Ukraine's presidential elections set for May 25.

The leaders met at the White House on Friday with the crisis in Ukraine high on the agenda.

The threat of new sanctions came as Russia's ambassador to the United Nations warned Ukraine's crackdown on pro-Russia protesters was a "fatal error".

Al Jazeera's Patty Culhane reports.

Source: Al Jazeera