Russian President Vladimir Putin has warned his Ukrainian counterpart, Petro Poroshenko, that he will implement "protectionist measures" if Ukraine signs an agreement for closer ties to the EU.
However, Mr Putin also indicated that he would welcome any proposals to de-escalate the situation in the east of Ukraine, where there have been bloody clashes between Ukrainian forces and pro-Russian separatists.
More top news
The last day of the inquiry into Alexander Litvinenko's murder has heard that Vladimir Putin should be held responsible for his death.
American philanthropists have pledged to match new donations up to $100,000 to the research team who had been tracking Cecil since 2008.
As our Changing Minds series on mental health comes to an end, we take a look back at the stories which made the news this week.