BUCHAREST, April 2, 2008 (AFP) - US President George W. Bush on Wednesday envisaged an 'unprecedented level' of cooperation between Russia and NATO by integrating former Soviet military sites into an anti-missile system in Europe.

'We are inviting Russia to join us in this cooperative effort,' said Bush in Bucharest, venue of a NATO summit that will also include Russian leader Vladimir Putin.

He proposed that Soviet-era military sites could be part of a 'threat-monitoring system,' and added: 'This could lead to an unprecedented level of strategic cooperation between Russia and the NATO alliance.'