Russian anti-corruption campaigner and opposition figure Alexei Navalny said on Thursday he had filed a lawsuit against Vladimir Putin after a company in which the Russian leader's son-in-law is a shareholder received $1.75 billion in state support.

Supporters of Navalny endorsed the candidate for president and prepared to file his nomination with Russian election officials

Russian President Vladimir Putin is running for a fourth term in office and is wildly expected to win the March 18 election.

Russian officials should review opposition leader Alexei Navalny’s calls for an election boycott to see if they might be breaking the law, the Kremlin said Tuesday, hinting at possible legal repercussions.