Ukraine's president called for officials to draft an formal claim, as recent estimates from Kiev suggest the bill could exceed $50 billion.
Since Russia's annexation of Crimea in 2014, the question of where Ukrainians go to worship has become a political issue.
During a hearing, Pompeo upheld the statement as an example of President Donald Trump’s decisive foreign policy.
In a separate interview with Fox News, Putin said Moscow did not interfere in the 2016 presidential election.
Bolton was grilled by reporters over his past comments about Russia.
A recent coordinated attack on a Roma community left one man dead, and Jewish monuments have been defaced across the country.
The head of Ukraine's cyber police said the preparation that's been detected could only have been done by Russian hackers.
Russian media was very excited by Trump's comments about Ukraine and Crimea.
U.S. air presence over the Black Sea angered Moscow.
The U.S. State Department demanded an end to the hostilities as the conflict entered its fifth year.
Russia uses these groups to fuel its propaganda.
The two countries were rivals during the Cold War but a lot has changed since then, including what it takes to fight a war.
The man captured after a Russian journalist staged his own death says his murder plot was also a hoax used to spy on Putin.
Arkady Babchenko has been criticized for handing a victory to pro-Kremlin media.
Authorities in Ukraine say they staged the journalist’s death in an effort to capture those who were actually trying to kill him.
Military officer Oleg Ivannikov's unusual voice helped investigators pinpoint him as a key suspect.
Russian President Vladimir Putin said that without "trust," Moscow and Washington may resort to "force," and "this might lead to tragedy."
The families of the dead have published an emotional open letter.
A new malware called VPNfiler is spreading across the globe.
Trump reportedly gave Ukraine the missile system after the country stopped cooperating with the Mueller investigation.
The sea mammals were being trained in a Soviet-era facility in Sevastopol that breeds marine assistants for the navy.
Four years after annexing Crimea, the Russian leader unveiled a bridge to Russia and the builder’s feline mascot has become famous all over the country.
The bridge restricts Ukrainian access to the Black Sea.