At least 20 others were detained by police on a street near the route of President Putin's motorcade to his inauguration ceremony in Moscow. They included some who had been sitting outside a French bistro wearing the white ribbon of protest on their jackets and coats.
Moscow police said about 120 people had been detained for staging unsanctioned pickets and most would soon be released. Elsewhere in the capital, several thousand people staged a rally supporting Putin.
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The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.