everyone in this situation is problematic and that we shouldn't give Russia a free pass just because it is May who is pointing out there might be issues, as you seem to be suggesting. And if we are looking at who is for/against, then why isn't it relevant that RT/breitbart are pushing the same narratives that you are aligning with?
I am not aligning with any narrative that I am aware of. I am not on Twitter. I subscribe to the Irish Times and the Washington Post, the Economist, and some other quality US sites (Atlantic, NY Times) and I look at a few specialty items like shipping news, Foreign Affairs, also the Belfast Telegraph and several more (Guardian, Spiegel). I don't pay any attention to Breitbart or RT or Drudge.
I agree everyone in this situation is problematic. What I am proposing is that Theresa May does not get a free pass on this matter just because she whistled 'Russia'.
I am surprised at the fact that some have not heard of Katyn. I grew up in a country where prayers for the conversion of Russia (from Communism) were offered at Mass, and where empathy for the suffering Catholic Poles was very strong. The suffering people of Central America being used as pawns by both sides in the Cold War got equal sympathy. Many Irish missionaries worked with the poor in that region and their religious orders published magazines detailing their work and the circumstances the people faced there. I learned of Katyn long before I encountered WW2 in a history course, and also heard a completely uncritical account of the life of Archbishop Stepinac, who may or may not have collaborated with the Croatian Ustaše regime (the existence of which I only learned about in my teen years from independent reading).
Both Britain and the US participated with the USSR during WW2 in hiding the Katyn massacre and then in clouding the facts about it until the Cold War got under way, when it became politically expedient to use it as a means of casting the former ally in a poor light.
Russia admitted that the USSR perpetrated the Katyn massacre in 1990, and has not disputed it since then. In 2010 the Polish government and president were on their way to a historic joint ceremony at the Katyn site with the Russian government in which the ghosts of Katyn were to be put to rest. Many top officials in government and in the armed forces were in the same plane, which went down in dense fog near Smolensk while attempting a landing. There have been various conspiracy theories about this crash since then despite a joint Russian Polish investigation that concluded that pilot error was to blame.
Irish history syllabi tend to focus on themes and processes and not individual events. Incidents are not used for DBQs either. Just as a matter of interest, are incidents like Katyn or the Oradour massacre the subjects of individual focus in A level history, or briefly mentioned in a wider context?
I am baffled by the 'bit of this, bit of that' approach in history teaching in the UK. Chronology and the wider context are really important in history.