James Lewis actually said...

We do have red lines. Then-Secretary Panetta laid them out in a speech last October.

You need to engage the Chinese directly and tell them, this isn't what responsible nations do.

If a cyber attack looks like it will cause the death of American citizens or do significant economic harm to the U.S., we will use military ...

We are not going to get a treaty; we can get agreement on norms and confidence-building measures, and the U.S. is a leader in this.