Ukraine's acting President has told the country's parliament that "terrorists" armed with anti-aircraft missiles were responsible for shooting down a military helicopter near the town of Slaviansk.
Fourteen servicemen, including a general, reportedly died in the attack in the east of the country.
"I have just received information that terrorists using Russian anti-aircraft missiles shot down our helicopter near Slaviansk. It had been ferrying servicemen for a change of duty," Oleksandr Turchinov said.
More top news
Drivers are being warned of hazardous conditions as the big freeze continues to bring disruption to roads and airports.
The president will continue to fight the 'constant hostility' from the press, one of Trump's closest advisers has told ITV News.
Temperatures tumbling again tonight with a widespread sharp frost and lows of -5C or -6C and icy spots in places