Alexei Navalny, the man who is planning to challenge President vladimir putin in the 2018 Russian presidential election, was just arrested.

Heres a quick breakdown of who he is, why he was incarcerated, and why it seems that will do little to dissuade his political ambitions.

Who is Putin critic Navalny? Alexei Navalny is a Russian activist and lawyer who has announced his intentions to challenge President Vladimir Putin in Russia's 2018 election. He is perhaps best known for the work of his Anti-Corruption Foundation, a group he created to keep tabs on Kremlin politicians, though his documenting of alleged Kremlin abuses of power began with a blog he started nearly a decade ago. He had now been amassed a loyal following of mostly younger and middle-aged Russians, with more than two million followers on Twitter alone. Navalny is so popular he placed second in the 2013 Moscow mayoral election. While his request for a recount was ultimately repudiated, his stronger-than-anticipated finish reportedly rattled the Kremlin in a big way.

RUSSIAN OPPOSITION LEADER ARRESTED BEFORE MASS DEMONSTRATION IN MOSCOW

Why was Navalny apprehended ? On the eve of a series of protests he had been organizing, Navalny announced that he would be changing the locating of the planned demo in Moscow to one of the citys most popular streets. Navalny claims he was forced to change venues for logistical reasons, even suggesting that some contractors were being pressured not to work with him. Russian law enforcement officials, however, are reportedly calling Navalny's decision a “provocation” intended to encourage his followers to engage in an unsanctioned, and therefore illegal, protest. The protest also happens to be coinciding with the national holiday known as Russia Day, a celebration of the nation's declaration of sovereignty. Navalny was arrested at his home before he could attend the demo. There have been reports that internet and electricity were cut in his office as he was being detained.

Second arrest this year: Navalny was apprehended back in March after allegedly rejecting police orders during a widespread day of protest( which he helped coordinate) that has been described as the largest the country has seen in years. The protests came just a few weeks after Navalny published the results of an investigation he and his associates had been conducting, in which he claimed Russian Prime Minister Dmitry Medvedev was allegedly concealing lucrative business deals via a web of charities run by his associates. The accompanying video presentation Navalny posted to YouTube has been watched more than 22 million times since March 2. The State Department condemned the arrest of Navalny and hundreds of other peaceful protesters, as well as the raids carried out at Navalnys organization. Spokesperson Mark Toner added that[ t] he Russian people, like people everywhere, deserve the ability to exercise their rights without fear of retribution. Medvedev suggested a few a few weeks later that Navalny's investigation was an “absolutely false” product of people he described as “political scoundrels.”

THE LATEST: HUNDREDS ARRESTED IN RUSSIAN CORRUPTION PROTESTS

Will the recent arrest deter Navalnys presidential aspirations? Alexei told me to pass on to us that the plan hasnt changed, Navalnys wife, Yulia Navalnaya, tweeted earlier Monday. While she may have been referring to the plan to hold protests in a new and unsanctioned place, Navalny has previously made clear that he plans to continue his political campaign despite suggestions that he may be disqualified from operating. In February, Navalny was found guilty of theft, but was given a five-year suspended prison sentence. He denies wrongdoing, and suggests the charges were trumped up to prevent him from following through with his presidential running. However, Russian statute reportedly stipulates that being sentenced to prison time for international crimes such as larceny is a disqualifying factor for anyone trying to run for political office. Navalny believes that because his sentence was suspended, the constitution legally allows him to run.

A controversial figure: Navalny says accusations that he represents a dangerous form of Russian patriotism are part of a coordinated attempt to sabotage his movement. In response to claims that he views some groups as second-class citizens, Navalny has argued that he himself is half-Ukrainian, and abhors the notion of second-class citizen entirely. He is frequently criticized for his 2007 call for the legalization of firearms, and his previous attendance at the Russian March, a yearly rally featuring neo-Nazi groups and imagery.

So strong, so dangerous or so free? After interviewing Navalny for a piece in The New Yorker, Masha Gessen had this to say about what she called the “very strange form of freedom” being enjoyed by this potential Putin presidential challenger: “The strangest thing about Alexey Navalny is that he is walking around Moscow, still. Here is what has happened to the other men who headlined the Russian protests in 2011 and 2012: Boris Nemtsov, the liberal, is dead, shot in view of the Kremlin in February of last year; Sergei Udaltsov, the radical leftist, is in jail, serving a four-and-a-half-year sentence for allegedly plotting to overthrow the Russian government; Garry Kasparov, the chess champ who became a legislator, is in exile, as are many others. Meanwhile, Navalny is living in Moscow and openly running several political projects … Since Navalnys prison sentence was aborted, he has continued to occupy a unique space in Russian society: he is a man so strong, or so dangerous, or so freeor all of those thingsthat the usual Kremlin tools cannot work against him.”

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