Russian Deputy Foreign Minister Sergei Ryabkov on Monday warned the U.S. against the potential "fatal consequences" of allowing Kyiv to deploy U.S.-supplied weapons against targets inside Russia. "I would like to warn American leaders against miscalculations that could have fatal consequences. For some unknown reason, they underestimate the seriousness of the rebuff they may receive," Ryabkov said, according to Google-translated comments carried by Russian state news agency Tass. He noted that Russian President Vladimir Putin had repeatedly addressed the topic, giving "a very significant warning, and it must be taken seriously, with the utmost seriousness." Last week, U.S. Secretary of State Antony Blinken said the White House had approved a Ukrainian request to deploy U.S.-supplied weapons against targets in Russian territory, on t