Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Putin Critic Poisoned by Soviet-Era Nerve Agent, Germany Says VOA News Germany said Wednesday that tests performed on specimens taken from Russian opposition leader Alexei Navalny showed the presence of the Soviet-era nerve agent Novichok. A special German military laboratory had shown proof of "a chemical nerve agent from the Novichok group," Chancellor Angela Merkel's spokesman, Steffen Seibert, said in a statement. .