Apple has complied with Russian demands to show the annexed Crimean peninsula as part of Russian territory on its apps.
Russian forces annexed Crimea from Ukraine in March 2014, drawing international condemnation.
The region, which has a Russian-speaking majority, is now shown as Russian territory on Apple Maps and its Weather app, when viewed from Russia.
But the apps do not show it as part of any country when viewed elsewhere.
The State Duma, the Russian parliament's lower house, said in a statement: "Crimea and Sevastopol now appear on Apple devices as Russian territory."
Russia treats the naval port city of Sevastopol as a separate region.
The BBC tested several iPhones in Moscow and it appears the change affects devices set up to use the Russian edition of Apple's App Store.
Apple had been in talks with Russia for several months over what the State Duma described as "inaccuracy" in the way Crimea was labelled.
The tech giant originally suggested it could show Crimea as undefined territory - part of neither Russia nor Ukraine.
But Vasily Piskaryov, chairman of the Duma security and anti-corruption committee, said Apple had complied with the Russian constitution.
He said representatives of the company were reminded that labelling Crimea as part of Ukrainian territory was a criminal offence under Russian law, according to Interfax news agency.
"There is no going back," Mr Piskaryov said. "Today, with Apple, the situation is closed - we have received everything we wanted."
He said Russia was always open to "dialogue and constructive co-operation with foreign companies".
Apple has not yet commented on the decision.
Just checked on my phone, it's true!— Will Vernon (@BBCWillVernon) November 27, 2019
Apple has complied with Moscow’s demands to show Crimea, annexed from Ukraine in 2014, as Russian territory. Crimea & the cities of Sevastopol & Simferopol are now displayed as Rus. territory on Apple’s map & weather apps when used in Russia
Google, which also produces a popular Maps app, also shows Crimea as belonging to Russia when viewed from the country. The changes happened in March.
When Google Maps is viewed from Ukraine, the maps show no clear border between Crimea and Ukraine but also no border between Crimea and Russia, according to BBC Monitoring.
Most of the international community, including the EU and the US, does not recognise the annexation of Crimea to Russia.
The loss of Crimea is a deep wound for Ukrainians. Shortly after the peninsula was annexed in early 2014, a separate conflict broke out in the eastern Donetsk and Luhansk regions when separatists moved against the Ukrainian state.
Ukraine and the West accuse Russia of sending its troops to the region and arming the separatists.
Moscow denies this but says that Russian volunteers are helping the rebels. More than 13,000 people have been killed in the conflict.
The BBC does not show Crimea as part of Russia on its maps, but shows a dotted line to mark disputed territory.