There are proactive ways to Stop  any conflict or situation (war) one found himself. Boycotting Russian's own Gambling company might not be the best way to Stop the war. It will only affects the Nation's GDP, but remember other Countries will support Russian to Sustain during the war. If you boycott these companies, what of those people that have invested a lot.

Although it is a war tactics, but innocent people suffered the more.

The best ways to stop war are:

1. Set up a committee for the both sides of the war plus a neutral committee

2. Call the two parties for a dialogue

3. Settle the immediate and remote causes of the war.

With these I believe war can be called to a resolution stage.