I’m not sure about “dark day for the media” but it does feel like a dark day for Israel. Once you’ve established that the government can unilaterally ban a voice for reasons of “national security” you’ve essentially given them a free pass. As Americans living post-9/11 will know, “national security” is a deliberately elastic term that can cover anything required in the moment.
The USA seems to not have followed through (as far as I know - as Russian news sites seem to be available).