Mr. Ponomaryov told reporters after the protest that an estimated 1,000 people were arrested, including dozens who tried to block a main street leading to Red Square.
Moscow quashes postelection protests →
"The reforms will simply create an imitation of a multiparty system," said opposition lawmaker Mr. Ponomaryov. "There will be 200 political parties, and no one will be able to tell the difference between them."
Massive anti-Putin movement splinters →