Difficult to estimate because the situation is de-stabilising--the assurances of MAD no longer hold if one side thinks it can prevent the other from launching.
The Biden administration largely turned the lights back on in the parts of the government you are asking about, I think. They tried, at least. The GOP tried to block re-hiring foreign policy experts towards the beginning of his administration.
Sources:
https://www.theguardian.com/us-news/2020/may/30/trump-us-amb...
https://www.npr.org/2021/11/13/1055575802/lack-of-american-a...
https://www.npr.org/2020/08/18/903199848/under-trump-more-bi...
Moreover, The Russia and China embassies were not affected And importantly there were not active conflicts, saber rattling and serious instigations as we have now. I mean, who gives a rat's arse about the ambassador to Paraguay.
Just the other week, the admin told the USN to prep for war against China in '27.
We assassinated an Iranian major general [1]! We were occupying Afghanistan, supporting Riyadh in its war on the Houthis and ramping up troops deployed in Syria and Iraq [2].
> saber rattling and serious instigations as we have now
The Trump administration wasn't instigating China [3]?
[1] https://en.wikipedia.org/wiki/Assassination_of_Qasem_Soleima...
[2] https://www.npr.org/sections/parallels/2017/12/01/566798632/...
[3] https://trumpwhitehouse.archives.gov/briefings-statements/re...