Crowd gathering in Saint Petersburg.
Live stream of march, which now looks like it has about 200 people, here. There are some hecklers. The cameraman calls them "Titushky," the word Ukrainian protesters used for pro-government men, dressed in street-clothes, who would sometimes physically attack Euromaidan protesters.
Our Russian Service reports that Ukraine's Party of Development, a group created from members of the former ruling Party of Regions, will not participate in Ukraine's parliamentary elections. The press service of the party says "millions of voters" will be unable to take part because of the ongoing conflict in eastern Ukraine.
Our Russian Service talks to Aleksandr Ryklin, an opposition journalist and political activist, about today's march in Moscow.
"Russia today is positioning itself in the world as an aggressor -- and it isn't hiding this, in fact it is doing it openly," he says. "The group in power, which now controls everything, has somehow ceased being ashamed of anything. It now feels like it can do anything.
"We -- I'm speaking now from the point of view of the march organizers -- are counting on the fact that there are still enough people who feel that the political situation is detrimental for the country and nation, who can't agree [with the authorities], who are willing to resist and will march to exhibit their rejection of this kind of power politics."
The tweet has since been deleted.
In advance of today's March, here are photos from a much smaller one held on March 2, just as Russian troops were beginning their incursion into Crimea. The tweet, from activist Victor Korb, says, "We took part in a peaceful picket, 'No to War!' at a time when it was neither vogue nor possible."
Antiwar demonstrations to be held today in Russia:
Antiwar demonstrations against Russia's role in violence in eastern Ukraine are expected to take place on September 21 in Russia's two largest cities, Moscow and St. Petersburg.
Aleksandr Ryklin of the opposition Solidarnost movement said the slogan for the "peace" marches is "Putin, enough lying and making war!"
It was unclear how many people would participate in the marches.
Similar events are planned in other Russian cities and cities outside Russia such as Prague, Berlin, and San Francisco.
The marches coincide with "International Day of Peace" declared by the United Nations that falls on September 21 every year.
This ends our live-blogging for September 20. Be sure to check back tomorrow for our continuing coverage.