MOSCOW, Sept 22 (Reuters) - The Kyoto Protocol will have virtually no impact on slowing global warming unless it expands to take in the United States, China and more developing countries, Russia's chief climate negotiator said on Wednesday.

Russia is the world's fourth largest emitter of carbon dioxide and a key player in United Nations talks about whether to extend Kyoto when its first phase lapses in 2013, or replace it with a wider treaty that brings in poorer nations.

President Dmitry Medvedev's top climate change adviser, Alexander Bedritsky, said Russia is demanding a new deal as the 40 industrialised nations bound by Kyoto represent only 28 percent of global emissions.

"28 percent of the world cannot change anything," Bedritsky told journalists on the sidelines of an Arctic forum in Moscow.

"Countries can work and fulfil their targets, but nothing will change. The burden on the climate will grow."

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