Diplomacy: Theory and Practice, 6th ed.  –  Online updating pages

Chapter 7: Embassies

p. 105, last para, locally engaged staff: according to an article in The Washington Post of 3 December 2021 (see Furthe reading), Russian embassies and consulates are an exception: they emply no LE staff at all, relying exclusively on Russians.

Further reading

Khurshudyan, Isabelle and John Hudson, ‘Amid heightened tensions, Russia and U.S. make quiet breakthrough on staffing at Moscow embassy’, The Washington Post, 3 December 2021

Toosi, Nahal, ‘America’s Last Man standing in Moscow’, Politico, 20 February 2022
A very full article on the US Embassy in Russia during the Ukraine crisis, with good links to other articles.

Young, John W., David Bruce and Diplomatic Practice: An American ambassador in London, 1961–9 (New York, 2014). It  was stupid of me to have forgotten to list this valuable book. It is focused precisely on this important ambassador’s various roles relative to other diplomatic channels, exhaustively researched, full of instructive examples, and very clearly written.