The US says Russia is putting chips from home electronics in tanks due to the effect of sanctions.
Russia's military relies heavily on technology made by the US and allies, who have banned exports.
The US commerce secretary said Wednesday that sanctions "cripple" Russia's ability to fix equipment.
Russia is having to use computer chips intended for home appliances to repair its military hardware due to the impact of US sanctions, according to a US official.
"Our approach was to deny Russia technology — technology that would cripple their ability to continue a military operation.
Russia's two major tank plants — Uralvagonzavod Corporation and Chelyabinsk Tractor Plant — have halted work due to lack of foreign components," it said.
In March, Ukrainian troops found what appeared to be Russian army bandages dating to 1978 discarded on a battlefield. »