If a symbolic denouncement is indeed the goal, Magnitsky sanctions are likely the right tool, as they would send a powerful message of solidarity with protesters to both the Hong Kong and mainland authorities. 

America’s sanctions strategy is increasingly burdened by the involvement of systemically important financial institutions and sovereign investors in global financial statecraft. In the post-9/11 world, Washington’s strategy was highly effective in pursuing non-state actors like al-Qaeda or ISIS, as well as small, rogue nations like Iran. Yet in addressing larger sovereigns like the Kremlin, US strategy has struggled to maintain the same effectiveness given the cross-border financial connections linking these entities to Western markets. As an era of great power competition among Washington, Moscow, and Beijing sets in, these foes will crowd out smaller, non-state actors, thus demanding an adequate response from the Treasury.