Telegram said Mr Durov travels in Europe frequently and added that it abides by European Union laws, including the Digital Services Act, , externalwhich aims to ensure a safe and accountable online environment.
“Almost a billion users globally use Telegram as means of communication and as a source of vital information,” the app’s statement read.
“We’re awaiting a prompt resolution of this situation. Telegram is with you all.”
Judicial sources quoted by AFP news agency say Mr Durov’s detention was extended on Sunday and could last as long as 96 hours.
Pavel Durov, 39, was born in Russia and now lives in Dubai, where Telegram is based. He holds dual citizenship of the United Arab Emirates and France.
Telegram is particularly popular in Russia, Ukraine and former Soviet Union states.
The app was banned in Russia in 2018, after a previous refusal by him to hand over user data. The ban was reversed in 2021.
Telegram is ranked as one of the major social media platforms after Facebook, YouTube, WhatsApp, Instagram, TikTok and Wechat.
Mr Durov founded Telegram in 2013. He left Russia in 2014 after refusing to comply with government demands to shut down opposition communities on his VKontakte social media platform, which he sold.
On Sunday, the Russian Embassy in France wrote on Facebook that it was seeking to “clarify the reasons for the detention and to provide for the protection of Mr Durov’s rights and facilitate consular access”.
The post added that French authorities had not been cooperating with Russian officials.
Russian foreign ministry spokeswoman Maria Zakharova posted on Telegram asking whether Western human rights NGOs would be silent on Mr Durov’s arrest, after they criticised Russia’s decision to “create obstacles” to the work of Telegram in Russia in 2018.
Telegram allows groups of up to 200,000 members, which critics have argued makes it easier for misinformation to spread, and for users to share conspiracist, neo-Nazi, paedophilic, or terror-related content.
In the UK, the app was scrutinised for hosting far-right channels that were instrumental in organising the violent disorder in English cities earlier this month.
Telegram did remove some groups, but overall its system of moderating extremist and illegal content is significantly weaker than that of other social media companies and messenger apps, say cybersecurity experts.
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