Four people who climbed a Moscow skyscraper today and attached a Ukrainian flag to its spire have been charged with vandalism by Russian police and may face three years in jail.
The protesters also managed to paint half a massive yellow star at the top of the spire with blue paint, so it resembled the yellow-and-blue national colours of Ukraine.
A photograph on social media, which could not be verified independently, showed a man in a climbing harness, standing on top of the star, with the Ukrainian flag tied to one of its points. He appeared to be taking a "selfie".
The building is one of seven skyscrapers in the city dating back to Stalin era. The tallest of the buildings, Moscow State University, stands at 240 metres.
More than 1,200 people have been arrested in Russia one day after major riots in southern Moscow, the BBC reports.
The "pre-emptive" raid targeted migrants, Russian news agencies said.
Yesterday rioting erupted in Moscow after a migrant from the Caucasus was blamed for the murder of a young ethic Russia man.
Demonstrators, some chanting racist slogans, vandalised shops and smashed windows in sites known for employing migrant workers in the southern Biryulyovo area.
Several hundred residents protested peacefully, demanding justice over the killing, but a large group of young men overwhelmed the peaceful demonstration, setting fire to shopping centre and stormed a vegetable warehouse employing migrants.
Moscow police said several officers were wounded in the riots, around 380 people were detained and a criminal case was opened.
Two exit polls have indicated Kremlin favourite Sergei Sobyanin was on track to win the Moscow mayoral election with about 53 per cent of the vote, according to state-run RIA and Itar-Tass news agencies.
But opposition candidate Alexei Navalny has disputed the results.
Sobyanin, the Kremlin-appointed acting mayor, needed at least 50 per cent to win the election outright and avoid a runoff. Navalny's campaign said its own exit polls showed Sobyanin received 46 per cent and Navalny 29 per cent.