It was an attention-grabbing assertion that made headlines around the world: U.S. officials said they had indications suggesting Russia might be preparing to use chemical agents in Ukraine. President Joe Biden later said it publicly. But three U.S. officials told NBC News this week there is no evidence Russia has brought any chemical weapons near Ukraine. They said the U.S. released the information to deter Russia from using the banned munitions. It's one of a string of examples of the Biden administration's ... deploying declassified intelligence as part of an information war against Russia. Coordinated by the White House National Security Council, the unprecedented intelligence releases have been so frequent and voluminous, officials said, that intelligence agencies had to devote more staff members to work on the declassification process, scrubbing the information so it wouldn't betray sources and methods. The idea is to pre-empt and disrupt the Kremlin's tactics, complicate its military campaign, "undermine Moscow's propaganda and prevent Russia from defining how the war is perceived in the world," said a Western government official familiar with the strategy. Multiple U.S. officials acknowledged that the U.S. has used information as a weapon even when confidence in the accuracy of the information wasn't high. Sometimes it has used low-confidence intelligence for deterrent effect, as with chemical agents, and other times, as an official put it, the U.S. is just "trying to get inside Putin's head."