Social network LinkedIn will be blocked in Russia, after a court found the company guilty of violating local data storage laws.
Russia’s communications regulator Roskomnadzor said LinkedIn would be unavailable in the country within 24 hours.
Some internet providers have already cut access to the site, which has more than six million members in Russia.
LinkedIn told the BBC it hoped to meet Roskomnadzor to discuss the block.
In 2014, Russia introduced legislation requiring social networks to store the personal data of Russian citizens on Russian web servers.
It is the first time the law has been enforced against a US-based social network.
Kremlin spokesman Dmitry Peskov told journalists in Moscow that Roskomnadzor was acting strictly in accordance with Russian law.
He added that the Kremlin had no intention of intervening in the situation.
A LinkedIn spokesman said: “Roskomnadzor’s action to block LinkedIn denies access to the millions of members we have in Russia and the companies that use LinkedIn to grow their businesses.
“We remain interested in a meeting with Roskomnadzor to discuss their data localisation request.”
Roskomnadzor spokesman Vadim Ampelonsky told the Interfax news agency that the regulator was working out the logistics of the meeting.