Can phased out domain names be renewed forever or they will stop working at the expiration date? Is .su a particular case? (nic.ru is selling .su domains (Soviet Union).

example: .tp, .yu

http://www.tetumbible.tp/
http://www.tropicalplants.tp/
http://www.ertp.tp/


http://www.beonet.yu/
http://www.kuccompany.co.yu/
http://www.panet.co.yu/