Supporters of pro-Russian separatists are also apparently gathering in Moscow's Pushkin Square, where the antiwar march is set to begin at 4PM Moscow time.
The tweet on top, from pro-Putin media entrepreneur Konstantin Rykov, says "Patriots wait for Banderovtsi in Moscow." The tweet on the bottom, from Savik Shuster, a popular Ukrainian TV host, says, "fascists on Pushkin Square await peaceful demonstrators."
As several thousand gather in Moscow's Pushkin Square for an antiwar demonstration, pro-Russian separatists have also been active today. A hashtag for the march (#маршмира) has been flooded with pornographic images and a number of people holding the flags of the so-called Donetsk and Luhansk republics have been spotted at the rally.
A large banner featuring opposition activists has been hung from the square, apparently by pro-Kremlin activists. It reads, "March of the traitors."
And "Novorossiya" flags have been hung along the route of the march.
A reminder that our Russian Service is offering live video coverage of the antiwar march in Moscow, which is officially beginning now.
Photojournalist Evgeny Feldman reports from Moscow: "From one side of the police line protesters shout 'Putin theif!' From the other, 'Crimea is ours.'"
The antiwar demonstration was organized by liberal parties, but there appears to be some participation by Russian nationalists.
A good long-read about the split in the Russian far-right over Ukraine here.
Our Moscow correspondent, Tom Balmforth, who is on the scene, speaks to Daria Nikolaeva, a 55-year old Russian teacher.
"I'm not only against us sending our troops to Ukraine," she says. "I'm against us interfering whatsoever in the matters of other sovereign states. Crimea set a precedent."
"I demand Russian troops leave Ukraine! -- Russian citizen"