Russia and China have condemned a US plan for a global missile defence shield, saying it will set back international disarmament efforts.
Russian President Dmitry Medvedev signed a joint statement with Chinese President Hu Jintao in Beijing.
The US says the shield, parts of which it plans to deploy in Europe, is key to its own security and that of allies.
Both Russia and China have opposed the plans in the past but this is the first time they have come together to do so.
The US, which wants to locate a radar base in the Czech Republic and an interceptor missile site in Poland, says the system will offer protection against missiles fired from states like Iran and North Korea.
However, the plans have soured US-Russian ties, with Moscow fearing that the system could be used against Russia.
The joint statement from Presidents Medvedev and Hu came as
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