Yes, this sentence was said by Putin in 1999. In August of that year, a terrorist act planned by Chechen armed rebel leader Basayev and separatists shocked the Russian government. At that time, when Putin was inspecting Dagestan, he came up with these hateful words: "If you catch a terrorist at the airport, you will kill him at the airport; if you catch him in the toilet, you will drown him in the toilet!"
In 2011, he served in Russia Prime Minister Vladimir Putin told the media that although his statement about "drowning terrorists in the toilet" was wrong, the content was correct.