Russia has invited US President Barack Obama to Moscow next year to mark the 70th anniversary of the Soviet Union's victory over Nazi Germany in World War II.
New York reeled after the murder of two uniformed cops by a man whom investigators say told bystanders to "watch what I'm going to do" just before the killings.
US President Barack Obama on Sunday "unconditionally" condemned the killing of two uniformed New York police officers who were gunned down in their patrol car in Brooklyn by a lone gunman.
The devastating cyberattack on Sony Pictures could see the Hollywood studio lose hundreds of millions of dollars in revenue and incur massive recovery costs.
US President Barack Obama imposed sweeping sanctions on Russia-annexed Crimea with an executive order prohibiting American exports of goods to the contested peninsula.
US President said he was not about to impose new sanctions on Russia over the Ukraine crisis, but nevertheless signed a law giving him the authority to do so.
Cyber attacks that ultimately prompted Sony Pictures to scrap the release of a madcap comedy about North Korea are a "serious national security matter."