Protesters have gathered outside the Russian embassy in Kiev to demand the release of hunger-striking Ukrainian pilot Nadezhda Savchenko.
Ms Savchenko is on trial in Russia after being captured in 2014 fighting with Ukrainian volunteers.
She is accused of directing artillery fire that killed two Russian journalists, which she denies.
Several thousand people began the protest in Maidan Square, before some protesters moved on to the embassy.
Photos show a demonstrator throwing bricks at the embassy and removing a security camera.
The Russian embassy has formally complained to Ukraine about separate attacks on its property overnight on Saturday.
Three cars were “seriously damaged” by unknown assailants, who also set off smoke bombs, spokesman Oleg Grishin was quoted as saying by the RIA news agency.
Police have described the case as hooliganism and are investigating.
Ms Savchenko has become a heroine in Ukraine and is seen as a symbol of the country’s resistance against Russia.
She began a hunger strike without water on Friday to protest the sudden adjournment of her trial the previous day as she was going to deliver a closing statement.