Putin warns West as he launches presidential bid

Putin stepped down in 2008 after two presidential terms, but kept his hold on power. He announced in September that he intended to return to the top job next year and on Sunday was formally nominated by his United Russia party.

"All our foreign partners need to understand this: Russia is a democratic country, it's a reliable and predictable partner with which they can and must reach agreement but on which they cannot impose anything from the outside," Putin told his audience.

The boisterous party congress, which was televised live, was aimed at boosting support for Putin and his party ahead of parliamentary elections one week away.

Increasingly seen as representing the interests of a corrupt bureaucracy, United Russia has watched its public approval ratings plummet in recent months. The party is still certain to win the Dec. 4 election, but is expected to lose the current two-thirds majority that has allowed it to change the constitution at will.

Putin's decision to swap jobs with President Dmitry Medvedev after the presidential vote in March, presented as a done deal at the party congress in September, also has soured the public mood. Many Russians are afraid that Putin will strengthen his authoritarian tendencies and remain in power for 12 more years to become the longest-serving leader since Communist times.