You may do the ritual any time you wish. Most people in the U.S. cannot do a ritual in the middle of a workday, so it has to be in the evening. 7:33pm is 3:33am in Moscow, which is numerically interesting and likely a time Putin will be asleep. It will be a new moon in the U.S., where many of us are doing the ritual.

There is no right or wrong in a magical working such as this. A hex is a hex. It is done when necessary, and right now, it is absolutely necessary. Aligning it with a new moon is simply a way to enhance the effectiveness.