It only works if everyone is doing the same, meaning other countries would also eliminating the virus. China still has the borders closed. It is a virus, if you

It only works if everyone is doing the same, meaning other countries would also eliminating the virus. China still has the borders closed. It is a virus, if you cut the spreading chain, it would stop spreading, it is logic. Lock-down works or not depending on the application of lockdown, if it isn't implemented fully, probably it is better not to have a lockdown (contact tracing, isolated cases with massive tests and so on). Again, you cannot hide massive breakout of a virus, if you didn't hear it, it didn't happen