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In the capital Moscow, several hundred people gathered amid heavy police presence. Protesters chanted “No war!” “Send Putin to the trenches!” and “Let our children live!”
According to protest monitoring group OVD-Info, most of the detentions took place in Moscow, where at least 530 people were picked up by police, and in St. Petersburg, where 478 were detained.
Here are a selection of photos of the rallies and detentions: