Ukraine's President Viktor Yanukovich is set to return to work on Monday after a period of sick leave, a statement on the presidential website said. Thousands of anti-government protesters have gathered in central Kiev to demand his resignation.
Members of Ukraine's far-right group - whose name translates as Right Sector - have been "training" in Independence Square in central Kiev.
The group has been a prominent albeit minor faction amid the many anti-government protesters on the streets of Kiev in recent weeks.
Some were clad in makeshift body armour made from what appeared to be lengths of pipe as well as shin guards more commonly worn by ice hockey players.
Some also carried handfuls of rocks and what appeared to be metal rods as they rehearsed drills in the open air.
Ukraine has experienced difficult days before but few have been so complex or so pivotal.
The Ukrainian government says it is is ready to use all tools available to restore order if violence and unrest continues.
These are difficult days for Ukraine, a country edging toward its second revolution in a decade.