MOSCOW (AP) — Russian voters are gearing up for a presidential election Sunday that Vladimir Putin is guaranteed to win. They are facing unusually intense pressure to vote, to grant him a convincing new mandate to pursue his nationalist strategy. Candidates were barred from campaigning Saturday, but the message to voters was clear from billboards celebrating Russian greatness — a big theme of Putin's leadership — and Kremlin-friendly media coverage.Putin urged Russians on Friday to "use their right to choose the future for the great Russia that we all love."