Some of them living an idle life, some of them working remotely.
Some of them working remotely, some of them have pre-saved capital, some of them are funded from abroad.
Some of them stay for years (elite, student, retirement, tourist visas), some of them stay for 3 months of visa free period, some of them come on package chartered tours especially in winter.
No. Half of people (less or more) don't support the war - why should they fight at it? They think it is not protective war for Russia so no remorses for them...