MOSCOW (Agencies) - Russian President Dmitry Medvedev on Tuesday ordered a "large-scale" rearmament and modernisation of Russia's nuclear arsenal, accusing Nato of pushing ahead with expansion near Russian borders. A top Russian General meanwhile said Moscow will deploy a new multiple-warhead, nuclear-capable missile after a key US-Russian arms control treaty expires in December. Meeting defence chiefs in Moscow, Medvedev said he was determined to implement reforms designed to streamline Russia's bloated military. Russia continues to face various security threats requiring robust defence capacity, he said. "From 2011, a large-scale rearmament of the army and navy will begin," Medvedev said at the meeting of the country's top defence chiefs. He called for a renewal of Russia's nuclear weapons arsenal and added that Nato was pursuing a drive to expand the alliance's physical presence near Russia's borders. "Analysis of the military-political situation in the world shows that a serious conflict potential remains in some regions," Medvedev said. He listed local crises and international terrorism as security threats and also stated: "Attempts to expand the military infrastructure of Nato near the borders of our country are continuing. "The primary task is to increase the combat readiness of our forces, first of all our strategic nuclear forces. They must be able to fulfil all tasks necessary to ensure Russia's security," Medvedev said. And while he praised Russia's military thrust into Georgia last year in defence of the rebel region of South Ossetia, he also said the conflict had shown up the military's failings. The comments came despite statements by Russia's leaders suggesting a thaw in relations with the US after the Bush era and the inauguration of Obama. Medvedev is due to meet Obama for the first time next month in London. Some analysts have detected a softening of US support under Obama for Nato enlargement to ex-Soviet countries on Russia's borders such as Georgia and Ukraine, an expansion that Moscow vehemently opposes. The head of Russia's strategic missile forces, Nikolai Solovtsov, told news agencies that Russia would start deploying its next-generation RS-24 intercontinental ballistic missiles after the December 5 expiry of the START-1 treaty with the United States. "After December 5, that is after the expiration of the START-1 treaty, a regiment with one command centre and one rocket division armed with RS-24 complexes with detachable warheads will be placed on a state of combat readiness," General Nikolai Solovtsov was quoted as saying. At least four warheads would be placed on the RS-24 missiles to be deployed, said Solovtsov, the commander of Russia's strategic missile forces. Solovtsov had announced last year that RS-24 missiles would be deployed in December 2009 at a base northeast of Moscow. In his comments Tuesday however, he linked the date of the RS-24 deployment to the December 5 expiration of START-1, a landmark 1991 treaty that limited the number of warheads and missiles in the US and Russian arsenals.