I’m saying that what your sources claim has never been stated by Russia, and none of these sources actually link to anything ever stated by Russia.
Yes, that is a claim you make. It is up to you to support that claim that you are making. That is how discussions generally work.
I make a claim
I provide sources for said claim
You refute the sources
You provide an argument for why the sources should not be believed.
Step 4 is what is missing, unless you count “because I say so” as a valid argument.
It would be easy to take a source, look at e.g. a quote in the source, it’s attribution and source, and then check if such a person in fact did make such a claim. If e.g. an article claim person X working for ministry Y made a pressrelease on date Z, but that person is know to work somewhere else, and no press release was made at all that day, then it’s easy to disprove the source. That is how you discuss. Not just “sure, you provided a source, but not the source I wanted, so therefore I will ignore it”. That kind of argumentation is not the least bit productive