I haven't seen this brought forward (at least it is not on our register). But I will check, maybe it was another complete dossier and got into a holding pattern situation (like Rwanda's sites). -> check done, have not found a nomination

Russia - Perm-36

It seems to me that Russia and China had expressed some hostility to the listing.

The ICOMOS evaluation also talks about opposition from countries that are still communist (Vietnam? Cuba?). But it is all about how you phrase it of course. OUV is more of an issue here, ICOMOS has always been very critical of this site (in its limited Solidarity scope).

France: Oradour-sur-Glane

We can also imagine a transnational serial inscription of the concentration camps (Buchenwald...), an extension of Auschwitz.

Viet Nam - Cu Chi Tunnels

I will admit that I have a hard time seeing OUV for most of these conflict sites.
WW's were global and have OUV and I understand the argument on architectural grounds for some of the monuments themselves but other than that I am very skeptical.
The issue for me being losing out on 1 or 2 truly worthy nominations being the lesser problem than opening the door to even more political posturing and contention and potentially lowering the bar so much that we get flooded with nominations that all get approved because how can you say no to one group suffering after saying yes to another?

Germany: Stasi Prison
Thailand: Death Railway
USA: Ground Zero

Armenia - Tsitsernakaberd (Armenian Genocide Memorial). That would really p...... off Turkey.... but, if Rwanda can have "Genocide Memorials" then why shouldn't Armenia. We know the answer of course..... it can't!

I expect not inscribe in the majority of cases from ICOMOS.

I'm not sure the US would pursue either of these, and I would think that any places of memory within the US would face political challenges. These might include the forced internment camps for Japanese citizens during World War II or the site of native American tragedies. Americans (for better or for worse) like to feel good, and sites of memory have the potential to bring up a lot of controversy as they highlight past injustice. I'm a proponent of facing our imperfect past, but I'm certain the entire country doesn't feel that way.

It was on the tentative list

I wasn't suggesting that all the places on this list would necessarily be likely to be nominated - was rather trying to identify a potential list for the "Category" and provide "comparators" for ones which have been or are more likely to be!
Thanks for suggestion about Japanese citizen internment camps. I knew of their history of course but was surprised when searching to discover that, indeed, at least one has been preserved as a National Historic Site - Manzanar

Since the US is currently planning to submit a nomination dossier in the next year or two for the Civil Rights Movement Sites (including two locations of assassinations of prominent leaders), I think their position has shifted slightly since Hiroshima's inscription. I do think the US is generally against "war related" sites being part of the world heritage list.