The US supporting a country fighting a defensive war against an aggressive invader isn’t equivalent to it invading another country and attempting regime change.
I think that the concern was not that the articles like the ones you link to do not exist. Instead the complaint is that the posted piece did not itself link to them to back up the claim. These were likely quite easy for you to find and it’s poor journalism that the author did not put in the same effort.
US says North Korea delivered 1,000 containers of equipment and munitions to Russia for Ukraine war (apnews.com)
U.S. is sending a carrier strike group closer to Israel and will begin supplying munitions starting today (www.nbcnews.com)
Anti-China Rhetoric Is Off the Charts in Western Media (thediplomat.com)