US Vice President Joe Biden has told Ukraine President Petro Poroshenko that the United States was working with European leaders on further sanctions on Russia, over the escalation of the conflict in Ukraine.
"The leaders discussed Russia's ongoing support for the separatists and apparent escalation" the White House said in a statement about the call between the two men.
"The vice president told President Poroshenko that the United States was engaging with European leaders to discuss the imposition of costs on Russia for its continued escalation of the conflict," it said.
More top news
ITV News' Tom Brady speaks to billionaire philanthropist Bill Gates about clean energy sources and a new $7bn green tech research fund.
A man accused of killing three people and wounding nine others in a shooting at an abortion clinic in Colorado has appeared in court.
Dean Lucas and Adam Coleman were in Mexico on a surf trip but it is feared they may have been victims of local violence.