Among the chips TSMC is no longer manufacturing and shipping are Elbrus-branded semiconductors that are designed in Russia, according to the person familiar with TSMC’s business.

Russia’s military and security services use Elbrus chips in some computing applications, according to Kostas Tigkos, an electronics expert at Janes, a U.K.-based provider of defense intelligence, who described the loss of TSMC’s help with the chips as “devastating” for Russia.

The Russian government has also been encouraging large domestic companies and banks to use Elbrus chips in their computers because the components are designed in Russia.