…[T]hese resolutions have limited legal effect; local governments are basically subordinate to state governments. But defiance like this can put political pressure on moderate Democrats — and, failing that, can force the state government to either (A) take drastic action to stamp out resistance or (B) give up and let these places refuse to enforce new gun laws, possibly ramping up state-police activity there as a replacement.
On the politics, it’s worth noting that the state Democrats have already caved on confiscating “assault weapons,” modifying a bill so that it would still ban sales going forward but would require current owners to register their guns rather than turning them in.
Robert Verbruggen in Virginia’s Second Amendment Sanctuaries: An Update