It’s a big problem for them.
Wow, good to get the party line, but really it only matters what Putin thinks, and even if he says what he thinks that probably means nothing, as I say it only matters what he actually thinks.
If the allegation is that Ukraine paid some Islamic terrorists to go shoot up the concert, there is not a lot of proof of it, or any sense in it since it would obviously give Putin an excuse to increase hostilities while enraging Russian people and reducing any anti-Putin sentiment among them, so what rational reason would there be to organize this? If the allegation is that the US or “NATO” did so, again, same comments apply, but Zelensky is probably a smarter person than anyone in the U.S. administration (a low bar, I admit), so perhaps somebody actually thought this might be a good idea.
If the Islamic terrorists just got a plan together to do this regardless of ongoing Russia-Ukraine war, then it has no real effect on war, even if terrorists were hoping to cross border into Ukraine (before the war, a ferry used to run from Odessa to Turkey, don’t know if that is still operational now).
I don’t really have a dog in the hunt, as I don’t trust Putin, Biden, Zelensky, European leaders, Trudeau or UN, and wish somehow they would all disappear from earth (along with Islamists and WEF etc) and leave normal people alone to figure out how to get along with one another. It should not be as difficult as profiteers are making it, but they only care about making money, and clearly every bad act pays off for somebody somewhere.