What role does leadership play in helping overcome struggles that generally arise when implementing a change management plan?

What role does leadership play in helping overcome struggles that generally arise when implementing a change management plan?
Communication is often the root cause of many change management plan failures. Actually, of the reasons why you listed, all of them can be traced back to poor communication in one way or another. In your experience, what are some of the best ways you should communicate during this execution phase? How might you work to turn things around if you notice communication is lacking?
There are a variety of different things that could go wrong. In terms of helping to mitigate some of these failures, how might periodic milestones be beneficial to ensure the plan stays on the right track?

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