Dear Gordon and others,
You may be interested to know that APNIC does have an internal procedure whereby "bogon" lists are periodically monitored.
When an instance of APNIC unallocated address space being announced is detected, a "cease and desist" order as you put it, is sent to the announcing ASN, and also upstreams providing transit.
As well as requesting that the announcements cease immediately, these notices point out that this address space may be allocated to a third party at any time with obvious consequences for routing.
This procedure is handled by APNIC hostmasters, who can be contacted at helpdesk at apnic dot net if you have any queries regarding this procedure.