"Please share a source that the allied powers are going to invade the beaches of Normandy". You can't, because people are working incredibly hard to keep that secret.
It is perfectly reasonable to infer what might happen based on past actions by the specific powers, and on world history. Attempting to gain geopolitical influence through propaganda is nothing new.
In one case it was "we have specific evidence of something that should cause us to go to war".
In this case it is "we can infer that a hostile foreign power will use a straightforward conduit to push propaganda to our populace if we come into conflict".
It's defense, not offense.
Maybe I'm being naive because I don't use TikTok, but all the partisan misinformation I see is being spread by either Americans on American social networks or maybe Russian disinformation bots operating on American social networks.