Ukrainians engage in mass protests

Protesters shout slogans during an opposition rally in Lviv, Ukraine. (Yuriy Dyachyishyn / AFP/Getty Images)

Dec. 1, 2013 12:08 PM PT

Tens of thousands of Ukrainians took to the streets Sunday to call for the resignation of President Viktor Yanukovich over his decision to keep Ukraine out of the European Union. Demonstrators waved Ukrainian and EU flags and carried signs blaming the government for violent tactics used by security forces Saturday against protesters.

Police guard a monument to Vladimir Lenin during an opposition rally in Kiev, Ukraine. (Efrem Lukatsky / Associated Press)

Protesters gather in the city center in Lviv, Ukraine. (Yuriy Dyachyishyn / AFP/Getty Images)

A protester in Kiev, Ukraine, uses tear gas against riot police outside the office of President Viktor Yanukovich. (Genya Savilov / AFP/Getty Images)

A stun grenade explodes among a group of protesters in Kiev, Ukraine, as they clash with police during a demonstration outside the office of President Viktor Yanukovich. (Genya Savilov / AFP/Getty Images)