Tens of thousands of Russians protested in Moscow and other cities on Saturday in the largest demonstrations Russia has seen in over a decade. Protesters are demanding the ouster of Prime Minister Vladimir Putin and have denounced suspected electoral fraud. In response to the protests, the Russian government has vowed to investigate allegations of fraud surrounding the nation’s recent parliamentary elections. Meanwhile, Russian billionaire Mikhail Prokhorov announced today he will run for president against Putin in the March presidential elections.