A former U.S. ambassador to Russia called Russian President Vladimir Putin a “coward” after police in Moscow arrested opposition leader Alexei Navalny’s lawyer.

Michael McFaul, who served as ambassador to Russia for two years during the Obama administration, took to Twitter to criticize Putin after Navalny’s lawyer Ivan Pavlov was arrested on Friday.

Join BJL on WhatsApp Status: Click here to Join BJL status for engagements, births, deals, levayos, events & more

Join BJL on WhatsApp Groups: Click here to Join an official BJL WhatsApp group for breaking news as it happens

“This is completely crazy. The rule of law in Russia is disappearing,” McFaul tweeted, sharing a news story about the lawyer’s arrest.

Pavlov has represented three organizations associated with Navalny that Russia is attempting to ban. He has accused the Russian government of hiding behind a closed court and labeling materials as secret when they are not, The Washington Post reported.

Read more at The Hill.