The Kremlin dismissed the Change.org petition as being driven by bots, with Kadyrov at the center of threats to behead the family of a human rights lawyer.
A Chechen rights lawyer, who along with his family members has been threatened to be killed by Chechen leaders, has left Georgia fearing for his safety in the Caucasus country.
U.S. troops have begun to arrive in Europe as part of President Joe Biden's move to reinforce NATO amid concern over a Russia military buildup near Ukraine.
In recent weeks, the authorities in Chechnya have carried out a wave of abductions of relatives of opposition bloggers and activists. Kremlin-installed Chechen leader Ramzan Kadyrov's opponents attribute the crackdown to the growing popularity and influence of the Telegram channel 1ADAT.