It's criminal to evade sanctions for a reason. As a Russian can tell you that oligarchs being able to convert dirty money into cool western lifestyle is probably the what keeps this thieving and oppressing regime going. If they were cut off from this, the regime would fall because very few insane people would associate with Putin for reasons other than personal gain. But they are not cut off cold turkey and they still have avenues where sanctions are not applied, like crypto, so they have time to sort things out.

Note that it's not illegal to provide humanitarian aid or help in other ways. It's not even illegal AFAIK to transact, as long as you make sure you are not involving anything or anyone sanctioned. (But I'm not a lawyer)