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The White House says it is appropriate for the Ukraine government to take action to restore law and order in the country.
It also urged Kiev to continue to to do so in a "measured and responsible" way.
White House spokesman Jay Carney told reporters travelling on Air Force One that Kiev had responded with "admirable restraint" to destabilising actions by armed pro-Russian separatists.
Two people have died and seven have been taken to hospital after a major crash on the M26 motorway in Kent.
It is not know how serious the injuries of the other casualties are.
Two people have died and seven are in hospital following a five-vehicle motorway crash in Kent.
Separatists flew the Russian flag on armoured vehicles taken from the Ukrainian army today in a bid to humiliate Kiev's operation to recapture towns in the eastern region.
Six armoured personnel carriers were driven into the rebel-held town of Slaviansk to shouts of "Russia! Russia!"
ITV News Europe Correspondent Emma Murphy reports
ITV Weather Presenter Amanda Houston has the latest forecast:
Students on board the capsized ferry Sewol were told told to stay still as the ship sank off the coast of South Korea today.
Mobile phone footage taken inside the vessel shows the youngsters sat slumped on the floor in their life vests.
Workmen in York discovered what was believed to be an unexploded "World War" mortar bomb this afternoon.
Bomb Disposal now on scene. http://t.co/6ArNBl0csh
The park and ride site where the discovery was made at 3.55pm was evacuated as bomb disposal experts attended the scene.
Good news confirmed by Bomb Disposal that the mortar shell is safe. Everything will revert to normal asap. Many thanks for your patience.
TRAFFIC: The #M26 due to remain closed to Londonbound traffic until approx 10pm. Thanks for your patience. Coastbound open but delays remain
British scientists have discovered an elusive protein that forms an essential part of human fertilisation.
The molecule, named Juno after the Roman goddess of fertility, allows eggs and sperm to join together.
It may now be used by scientists to improve fertility treatments and develop new contraceptives.
"We have solved a long-standing mystery in biology by identifying the molecules displayed on all sperm and egg that must bind each other at the moment we were conceived," said lead researcher Dr Gavin Wright, from the Wellcome Trust Sanger Institute in Cambridgeshire.
"Without this essential interaction, fertilisation just cannot happen," he added, writing in the journal Nature.
Fertility expert Dr Allan Pacey, from University of Sheffield, described the finding as "very exciting".