In season 3 episode 6 of Star Trek: Discovery, "Scavengers", we see the following exchange:
BURNHAM: Captain, the Federation cannot stabilize while the cause of the Burn remains a question. And there's a man's life at stake.
SARU: There are many lives. Today, I saw how vulnerable the Federation has become. The admiral would not be convinced by a cat in a ship. I understand this will be difficult, but, please, resume your duties and prepare the crew for a possible jump to Argeth.
BURNHAM: Yes, sir.
What is Saru referring to? It's clear from the montage at the beginning of the episode that a lot of time has passed between the previous episode and this one, so Saru should be well aware of the state the Federation is in. So what has happened "today" that made him see how vulnerable Federation is?