President Umaru Yar'Adua has come under pressure to step up his anti-graft drive in one of the world's most tainted countries since he came to power in 2007.
VOA: standard.2009.04.18
The visit by Secretary of State Hillary Clinton is yet another sign of President Barack Obama's urgent drive to restart the talks, which have been stalled since December.
VOA: standard.2009.10.30
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