Mexico could start testing a coronavirus vaccine approved in Russia as early as next month. The nation said it would provide at least 2,000 doses of the vaccine Thursday. Russia became the first country to approve a vaccine last week when President Vladimir Putin declared his approval while the vaccine was tested by just a few hundred people. The World Health Organization withholds approval because the Russian vaccine has not passed the rigorous checks that are normally necessary before approving a vaccine. Mexico is now negotiating with vaccine manufacturers in Britain, the US and China to buy a vaccine for its citizens as soon as possible. More than 540,000 cases of coronavirus were confirmed in Mexico, and more than 59,000 people died.