Russian Foreign Minister Sergey Lavrov said Thursday Russia would carry out the agreement on S-300 air-defense missile system with Syria. Speaking at the Russian state-run Rossiya 24 TV Lavrov said the contracts were not finished yet and thus S-300 air-defense missiles were not delivered fully. \"We respect all our contracts and are honoring all our contractual obligations,\" Lavrov said. Russia has been supportive of Syria\'s embattled President Bashar al-Assad and announced last month that Russia agreed to sell advanced S-300 air-defense missiles to Syria. Lavrov said Russia was not sure if western countries could persuade the Syrian opposition to attend a planned peace conference to be held on Syria in Geneva.