He said his arrest was “part of the massive pressure on journalists and analysts who objectively describe the course of the current war.”
“The goal of the Kremlin and (President Vladimir) Putin personally is to silence everyone,” he said.
He said he would continue with his reports.
“There’s nothing more important right now,” he said.
Nacke creates videos with Ruslan Leviev, the founder of the Conflict Intelligence Team, a team of bloggers investigating the Russian military.
A court has separately ordered the arrest of Leviev, who has also left Russia.
The court in Moscow on Tuesday also ordered the detention in absentia of Belotserkovskaya, a blogger with more than 900,000 followers on Instagram.
Belotserkovskaya, who lives in France, is a popular culinary blogger who has also published comments about Russia’s military campaign in Ukraine.
After Putin sent troops to Ukraine on Feb. 24, Russia introduced prison terms of up to 15 years for spreading information about its military deemed false by the government.
In March, Belotserkovskaya became the first target of the new legislation.
Many critics of Moscow’s offensive in Ukraine have been arrested and jailed including opposition politician Vladimir Kara-Murza and artist Aleksandra Skochilenko.
Independent media outlets including Novaya Gazeta have in recent weeks been shut down or suspended operations, and tens of thousands of Russians have left the country.