US official says more sanctions possible if Moscow disrupts May 25 election in Ukraine

A senior State Department official says that if Russia plays a role in disrupting the May 25 presidential election in Ukraine, the U.S. and European Union will move to impose additional economic sanctions against Moscow.

The official, who attended a meeting Thursday in London where Secretary of State John Kerry met with his counterparts in Britain, France, Germany and Italy, says the U.S. shared its strategy to use a "scalpel rather than a hammer" to target vulnerabilities in Russia's business, banking, mining, energy, defense or other sectors.

The official, who was not authorized to speak by name about the discussions in London, briefed reporters on condition of anonymity.

The meeting Thursday was held ahead of discussions about the Syrian crisis by U.S officials and their counterparts from 10 other nations.