Arseniy Yatsenyuk made the comment after Europe decided to implement new sanctions against Russia over Ukraine.
The slain journalist's parents said they collected money for a ransom payment, despite the threat of prosecution, which authorities deny.
Islamic State's Twitter users, which have trumpeted the group's violent acts and world view on the social media service, have gone quiet in past days.
Obama will use airstrikes against ISIS. The U.S. also pledged hundreds of millions of dollars to help refugees and the nations taking them in.
Al Qaeda's assaults on Sept. 11, 2001, led to all manner of weird and wacky theories, suggesting the U.S. abetted the terrorists.
The challenge for Washington? This is not the only U.S.-backed rebel group with shifty allegiances.
The president’s visit to Baltimore isn’t entirely about campaigning. Obama is also set to tour Fort McHenry.
President Barack Obama has been linked to the Illuminati after a photo taken of him Wednesday shows him with "devil horns."
President Obama chose retired Marine Corps Gen. John Allen to manage the effort to destroy the Islamic State.
Women, Latinos and young voters are becoming disillusioned with Obama.
The announcement came nine days after Gov. Jerry Brown asked President Barack Obama to officially term the August earthquake a major disaster.
Turkey, however, did not sign the joint statement, signaling its unwillingness to participate directly in the fight against Islamic State.
Australia has repeatedly raised the alarm about the number of its citizens believed to be fighting with Islamic groups in the Middle East.
"The president’s made clear that he doesn’t want boots on the ground, well somebody’s boots have to be on the ground,” House Speaker John Boehner said.
A CIA assessment said the number of fighters with the Islamic State in Iraq and Syria could be as high as 31,500.
In an interview with CNN, Secretary of State John Kerry said the fight against ISIS in Iraq and Syria was not a war.
Multiple Mideast powers with their own agendas make forging a coalition difficult.
After President Obama vowed to destroy ISIS in Syria, speculation mounts over how the U.S. and it allies will accomplish that goal.
The White House has removed more than 2.1 million immigrants since President Barack Obama took office in 2009.
Israel "fully supports" Obama's strategy, while Turkey said it will only participate in humanitarian missions in the campaign against ISIS.
The gap between Republicans and Democrats on terrorism has widened to an all-time high.
The Syrian National Coalition wants to take on both ISIS and Bashar Assad, but that's not Obama's strategy.