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think the word hi-tech is the issue, Ukraine have put forward evidence that Russia is still able to manufacture crude cruise missiles. Things like the planes and helicopters they have so many of them and can't use them due to not having air supremacy so are probably happy they can replenish them in the future and might as well trade them for useful things they can use in the current conflict. It also opens up a revenue stream with Iran and Iran have proven good at sourcing components despite sanctions, so can probably get the Russians the chips and sensors they are currently struggling to source
Russia and Iran deepen ties
https://www.nbcnews.com/politics/russia-providing-unprecedented-military-support-iran-exchange-drones-o-rcna60921