In a phone call to German Chancellor Angela Merkel, US President Barack Obama said that Russia had to take more steps to de-escalate the situation in eastern Ukraine.
Both leaders agreed that Russia should urge rebels to release hostages and end the flow of heavy weapons and fighters across the Russian border.
"The leaders agreed that to date neither the United States nor Germany has seen Russia fulfill these required actions," the White House statement said.
President and the Chancellor also reaffirmed their commitment to work together as well as to continue to support Ukraine’s long-term stability and prosperity, during the call.
More top news
Flood warnings and alerts are in place for Scotland and northern England, while high temperatures are set to continue further south.
The state recorded 331 new cases on Tuesday.
Researchers used the method to study why flocks of long-tailed tits segregate themselves into different parts of the landscape.