"Since the invasion, I haven't seen any articles on the topic and the US media have gone suddenly silent on their involvement." that's just not true pick your favourite search engine and you see articles on this topic from every major outlet.I checked for this Nyt, WP (US) , der spiegel(ger), guardian(uk). You see articles coming up the last 2 weeks, another spike was 2017 and before 2014. I guess if ran an analysis for I'd see spikes mentioning Azov, whenever the Ukranian topic was in the media