Russian prosecutors have opened a criminal case against former PM Mikhail Kasyanov - an opposition candidate in the 2 March presidential election.They accuse his campaign of forging some of the reported two million signatures on his nomination papers.
Mr Kasyanov is challenging Mr Putin's candidate Dmitry Medvedev. Mr Putin himself is barred from the March poll.
A spokeswoman for Mr Kasyanov's campaign described the prosecutors' move as "political pressure".
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