which as become increasingly beleaguered

Allegro molto

Senior Member

Guriev’s self-exile is the latest in a series of recent departures from government by wealthy, educated and Westernized elites who had aligned themselves with the leadership’s more liberal Medvedev-led faction, which as become increasingly beleaguered since President Vladimir Putin’s controversial re-election in May 2012.
(from Russia’s Newest Dissenters, June 6, 2013, the New York Times)

What does 'as' mean in the phrase 'which as become increasingly beleaguered'?

Thank you
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