The Rumanian trademark law does not obligate to file a statement /declaration of use. Nevertheless, in case that a registered trademark is not used for a period of 5 consecutive years within the period of protection, any interested third party is entitled to request before the Rumanian Court the cancellation of the respective trademark on non-use grounds.
For filing the reply to an official letter (provisional refusal, decision of the Reexamination Board, etc.), the Rumanian Patent Trademark Office (PTO) allows a maximum of 4 consecutive 3-month extensions of time; only the first extension implies official fees.