Russia Sues Ukraine Over $3 Billion Debt

Russia has filed a lawsuit against Ukraine at London's High Court over a $3bn (£2.1bn) debt.
According to the BBC, the action was taken following unsuccessful attempts to agree on a debt restructuring, Russian Finance Minister Anton Siluanov has said.
Ukraine announced in December that it would not make the repayment, claiming that Russia had refused to accept terms offered to other creditors.