If they want to keep their homeland, they'll have to do what all successful defenders of homelands have done: shoot back. Bullies don't like it when what they dish out is tossed right back at them, and either the land is worth fighting for, or it's not. Lawfare isn't shown to have ever been a successful tactic at preserving the homeland of any people absent the use of force.

Ask the Yanomami of Brazil.

Guns and butter.

Thanks!