Detailed Instructions: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Problem:Moscow (CNN) -- Chechen rebel leader Doku Umarov claimed responsibility Monday for last month's deadly attack on Moscow's main international airport that left 36 people dead. In a video message, posted on a website that regularly carries messages from Chechen rebels, Umarov said he was speaking on January 24 -- the day of the deadly bombing. He wore camouflage combat fatigues and a black skullcap. "The special operation was done in accordance with my order. Similar special operations will be taking place in the future," he said in Russian. The Kavkaz Center website said it received the message and posted it late Monday.NEW: Doku Umarov says he directed the January 24 airport bombingNEW: He promises more attacks in the future36 people were killed in the blast 
 Question:But he told _ state television the alleged bomber was under the influence of drugs before the attack.
Solution:
Russian