"I appeal to you [...] to stop supplying Apple services and products to the Russian Federation," Ukraine's Vice Prime Minister wrote in a letter to Tim Cook.
Under threat of fines, the Kremlin has strong-armed both Apple and Google into removing the opposition-created Smart Voting app from their respective stores.
Apple will reportedly start showing a dialog box to Russian users when they set up an iPhone, iPad, or a Mac for the first time to install some pre-approved government apps on the device.
Apple has revealed some user data is being stored on Russian servers as part of its compliance with a local law which came into effect in the country in 2015.