Reuters
Russia froze an order of the surface-to-air missiles to Iran earlier this year, citing restrictions under sanctions the UN Security Council imposed on Tehran in June over its nuclear activities.
Defense Minister Anatoly Serdyukov and his Kazakh counterpart, Adilbek Jaksybekov, met on Wednesday in Moscow to discuss strengthening military ties.
"The talks focused on … Kazakhstan's participation in the ballistic missile early warning system," Defense Ministry spokeswoman Irina Kovalchuk said after the meeting, Itar-Tass reported.
Moscow has been urging NATO to allow Russia's cooperation in a U.S.-led European missile defense system plan. President Dmitry Medvedev says failure to include Russia on the alliance's missile defense plans would trigger a new arms race.
The S-300 is a high-precision missile system, which Moscow has supplied to China and Venezuela.
"The discussions are under way for the relevant contracts," said Kovalchuk, without mentioning how many units it planned on buying.
Analysts say Kazakhstan has been in talks to buy two units of the system, which would cost about $150 million.