Viktor Bout is alleged to have sold arms to warlords in Africa and Afghanistan The Thai Prime Minister Abhisit Vejjajiva has said the alleged arms dealer Viktor Bout should be extradited to the United States.
His comments come after months of legal wrangling and delay to US extradition efforts.
An earlier attempt by the US to put Mr Bout on a plane was blocked by the Thai government.
Russia and the US have argued over the case, after his arrest in a joint Thai-US sting operation in 2008 in Bangkok.
Mr Bout was to be extradited in August, to face trial for conspiring to sell weapons to a Colombian rebel group.
The US and Russia have been squabbling over his fate since his arrest.
Mr Bout spent more than 15 years of allegedly running guns to African warlords and Islamic militants.
He was arrested at a Bangkok hotel by US agents posing as Colombian Farc rebels, after he allegedly tried to sell them weapons.
Mr Bout, dubbed the Merchant of Death by a British politician, is pleading not guilty to charges of conspiracy to sell arms to Colombian rebels.
He faces a maximum penalty of life in prison if convicted.
Moscow has been demanding his release, saying that Mr Bout is an innocent businessman.
Mr Bout, a former Russian air force officer, is thought to have knowledge of Russia’s military and intelligence operations.
Analysts say Moscow is perhaps worried he might turn state witness on trial in the US, and reveal more than Russia would be comfortable with.
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