MOSCOW — Thousands of nationalists are marching through the Russian capital, chanting slogans including "Moscow is a Russian city" to express their resentment of dark-complexioned migrants from the Caucasus and Central Asia.

The march comes on Unity Day, a national holiday established in 2005 to be observed on the same day that once commemorated the Bolshevik Revolution.

Nationalists accuse the Kremlin of lavishing privileges on migrants and minorities while ignoring ethnic Russians, and object to government subsidies to the restive, mostly Muslim Caucasus republics.

There were no immediate reports of violence at Sunday's march, which police estimated attracted about 6,000 people. But the ITAR-Tass news agency cited police as saying about 25 demonstrators wearing Nazi swastikas were arrested as they shouted slogans at a subway station in the city center.