The Russian Federal Service for Military-Technical Cooperation (FSMTC) brushed off report on Tuesday that it started delivering the S-400 surface-to-air missile systems to China, saying the delivery contract is "in strict accordance with its terms and conditions."

"The deliveries will be made within the deadlines secured in the relevant documents," Maria Vorobyeva, spokesperson for FSMTC, said.

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The statement comes a day after a Russian lawmaker told media that the S-400 supplies are getting underway to China. Vladimir Gutenev later clarified to online media that the S-400 were not on the delivery phase but rather on the production stage.

FSTMC also said that the S-400 Triumf delivery contract to China is expected to be accomplished by the end of the decade.

The Russian S-400 is the country's latest air defense system. It is loaded with three different types of missiles that could destroy aerial targets at a short-to-extremely-long range. It could also track and destroy aerial targets such as ballistic and cruise missiles.

Meanwhile, a new report from the US-China Economic and Security Review Commission released on Monday revealed that Russia and China are increasing their joint exercises and boosting sales of advanced weaponry to counter the United States.

Although the report concludes that policy differences and mutual mistrust between Russia and China will likely preclude to an extensive mutual defense agreement, the increased cooperation could be used to thwart the US and its allies in policy disputes, USNI News noted.

"Beijing and Moscow appear to be seeking to reduce the effectiveness of US-led missile defense systems through advanced missile development and other coordination," the report said, further noting that both countries "appear drawn together by similar concerns about what they consider explicit US-led efforts to contain them.

TagsRussia, china, S-400 missile system, defense system