The number of people killed in eastern Ukraine since last April has now topped 6,000, despite successive ceasefires, a UN spokesman said Monday.
Ukrainian protesters poured on to a central Kiev square on Wednesday, preparing to confront police anew after the bloodiest day since the former Soviet republic won its independence.
A firework explodes amid flames during clashes between anti-government protesters and riot police at Kiev's Independence Square Feb 18, 2014.
The amnesty law, which drops criminal charges against protesters arrested during the unrest in Ukraine, took effect on Monday.
German Chancellor Angela Merkel (R) welcomes Ukraine's opposition leaders Vitaly Klitschko (L) and Arseny Yatsenyuk before talks at the chancellery in Berlin Feb 17, 2014.
Ukrainian opposition protesters opened a road to limited traffic in Kiev, meeting an amnesty offer aimed at easing a stand-off over President Viktor Yanukovich's rule.
Russia had deployed anti-missile radars along its borders, Russian Defense Minister Sergei Shoigu said Friday.
Russian Foreign Minister Sergei Lavrov accused the European Union on Friday of pressing Ukraine to choose closer ties with the bloc at the expense of relations with Russia.
Germany must act decidedly in response to the crisis in Ukraine and sanctions against the government should be used as a threat if efforts seeking to find a political solution are rejected, German Foreign Minister Frank-Walter Steinmeier said Monday.
The prime ministers of the Visegrad Group, which includes Hungary, Poland, the Czech Republic and Slovakia, on Wednesday called for an end to the violence in Ukraine.
US Vice President Joe Biden on Tuesday "strongly encouraged" Ukrainian President Viktor Yanukovych to work with the opposition to find compromises critical to ending the country's current political crisis.
The prime minister of crisis-torn Ukraine has submitted his resignation.
Ukrainian Prime Minister Mykola Azarov offered his resignation on Tuesday, saying he was stepping down because of the threat to the economy caused by two months of unrest, his press service said.