Russian protesters defying a ban on unapproved rallies have faced off with supporters of Prime Minister Vladimir Putin in Moscow city center.
Protesters chanted slogans against the ruling party as the Putin loyalists beat drums and chanted "Putin, Russia".
Police arrested at least 100 protesters, including veteran liberal politician Boris Nemtsov.
A rally on Monday against alleged fraud in Sunday's parliamentary elections was Moscow's biggest protest in years.
Miriam Elder, a correspondent for The Guardian talks with host Marco Werman from the scene of the demonstrations.