Mr Lavrov told the conference Mr Biden's insistence that the Syrian leader step down was counterproductive.
Last week Mr Biden met with video game makers to discuss gun violence in popular media.
Mr Biden's weaknesses are exactly the opposite of Mr Warner's not too little experience, but too much.
"We can't solve it unless we know the full extent of it, " Mr Biden said.
Mr Biden is known for his affection towards Israel but took the announcement as a gratuitous insult.
In Mexico, Mr Biden will meet President Felipe Calderon and the three candidates in July's presidential vote.
But Mr Biden also recycled two Democratic talking points that I am beginning to find extremely irritating.
ECONOMIST: The Democratic National Convention: Ready on the left | The
Later in the day Mr Biden is expected to meet sportsmen, wildlife interest groups and entertainment industry organisations.
BBC: Joe Biden to make gun-control recommendations on Tuesday
But during a visit to Mexico on Monday, Mr Biden had said the US remained opposed to legalisation.
Mr Biden himself had said Iran needed to be "serious" on the issue.
Mr Biden has taken up similar public responsibilities to Mr Cheney as well.
Mr Biden said without such approval, the US would be unable to inspect and track the Russian nuclear arsenal.
BBC: Biden warns failure to pass nuclear treaty endangers US
Mr Biden has spent more than half his life in the Senate (he was elected when he was 29).
Mr Biden also said he had encountered widespread concerns over high-capacity ammunition magazines.
BBC: Joe Biden to make gun-control recommendations on Tuesday
Mr Biden has said he thinks some of his Republican colleagues are ready for a bipartisan approach to Iraq.
ECONOMIST: Strategy in Iraq: Coming to the end of options | The
Mr Biden said that the US "shared responsibility" in the fight against drugs.
Mr Biden arrived two days later and then demanded that Georgia become more democratic.
Mr Biden campaigns with bikers in Ohio, where he was also photographed giving a shoulder massage to a female biker.
Mr Biden told the conference it was "no secret" that Moscow and Washington had "serious differences" on issues such as Syria.
Mr Biden's visit went some way to assuage fears that the Obama administration's overtures towards Moscow had come at Georgia's expense.
But she has won more battles than she has lost notably with Mr Biden, over whether America should send 21, 000 troops to Afghanistan.
Mr Biden will also attend a meeting of the National Security Council.
Mr Biden repeated the attacks during an event in Florida on Wednesday.
Mr Biden's seat, though, was filled by someone widely assumed to be keeping the seat warm for Mr Biden's son, currently serving in Iraq.
White House spokesman Jay Carney said the emails had nothing to do with pressure to approve the loan, but instead with preparing Mr Biden's schedule.
Mr Biden himself and many State Department officials, together with George Mitchell, who was to have supervised the now-stalled proximity talks, advised cooling things down.
Mr Biden said he believed that the "ultimate determination of Russian democracy" would, in part, be judged by how the democratic countries around Russia developed.
Mr Biden and Mr Cameron are expected to discuss the security situation in Africa and the future of the UK's relationship with the European Union.
Mr Biden was speaking in Honduras where he met regional presidents.
The North Carolina vote came shortly after Mr Biden said he was "absolutely comfortable" with same-sex married couples having the same rights as other married couples.
BBC: North Carolina approves constitutional ban on gay union
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