Kiev said Wednesday it was ready to fight Moscow in court after the Kremlin vowed to sue Ukraine if it defaults on its $3.0 billion (2.7 billion euro) debt to Russia. 

"If Russia sues Ukraine, we are ready fight Russia in court," Yatsenyuk said at a government meeting while discussing a loan Moscow made to the country in 2013 under former Kremlin-backed president Viktor Yanukovych.