https://bank.gov.ua/en/news/all/natsionalniy-bank-vidkriv-sp...
Was sent to me by a Ukrainian colleague that I would trust. Ideally you have to send using direct transfer I think. The details for that are on that same page.
If you really care about civilian's lives, you should hope for the invasion to end as quickly as possible, not to drag along in the cities streets for weeks. There is no point in dragging the resistance for long as Ukraine has no chance of winning and the guerrilla will hit civilians hard.
Violence is the last resort for peaceful nations to stop further, more brutal violence of others.
Russia is making it harder and harder, reducing available options to resolve that war.