The breadth of the economic and market impact will depend on what types of sanctions are applied by the West. It’s likely such measures would further target a combination of Russian banks, investment, and trade (such as through barring Russia from the cross-border SWIFT network), and potentially, energy. In response, Putin could also retaliate through the energy sector, as well as through cyberattacks on the United States and Europe. The situation is fluid to say the least.
I approach these things thinking like a chess player. What is my opponent’s to best move? What is my best move, or least worst move, in response? And so on… the whole board not only includes Ukraine, but also Estonia, Latvia, and Lithuania, as well as China and Taiwan. If the West is unwilling to do anything meaningful except give passionate speeches, that is definitely a cue for China to be more aggressive.