KIEV, June 3. /TASS/. Ukraine’s nationalists affiliated with the extremist organization calling itself the Right Sector (outlawed in Russia) have been urged to cut short their vacations and all commanders, ordered to begin full mobilization, Right Sector spokesman Andrey Stempitsky has said.

"Those who are away on vacation or have left for home during the lull on the frontline should get ready to return to their units. The commanders of reserve battalions should declare mobilization to build up their squads to full strength and keep their men ready to leave for combat units or a training center," Stempitsky says in a message posted on Facebook.

Stempitsky said that "despite resistance from the advocates of armistice we will go to fight."

The Right Sector is a Ukrainian association of radical nationalist organizations. In November 2014 Russia’s Supreme Court declared it as an extremist organization and outlawed its operation in Russia’s territory. Earlier, Russia launched criminal proceedings against the group’s leader Dmitry Yarosh over calls for terrorism.