A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
A player, 18 February 2012
Does playing "The Perfect Moment" counts towards the entering play requirement of Ring of Void?
The Perfect Moment Reaction: After the end of an Attack Phase in which you were the Defender: Create an additional Attack Phase with the previous phase's Attacker as the Defender. During this Attack Phase, you will not destroy more than one of the Defender's provinces, and your Personalities may not assign and will not move unless they are Paragons or Battle Maidens.
Ring of the Void After you resolve your fourth or later non-Kiho action from Strategies in one phase: You may put this card into play from your hand.
Jon Palmer (rules official), 19 February 2012
Does playing "The Perfect Moment" counts towards the entering play requirement of Ring of Void?
The Perfect Moment Reaction: After the end of an Attack Phase in which you were the Defender: Create an additional Attack Phase with the previous phase's Attacker as the Defender. During this Attack Phase, you will not destroy more than one of the Defender's provinces, and your Personalities may not assign and will not move unless they are Paragons or Battle Maidens.
Ring of the Void After you resolve your fourth or later non-Kiho action from Strategies in one phase: You may put this card into play from your hand.
The Perfect Moment is played after the end of an Attack Phase, but creates a new Attack Phase that it is not itself a part of. Therefore it will not "count" towards Ring of the Void's four-card requirement.