He serves as Bishop of Ungheni and Nisporeni, a diocese of the Russian Orthodox Church in Moldova.
In 1992 Valeriu was tonsured a monk with the name Peter, and later on in 1992 Metropolitan Vladimir (Cantarean) of Chisinau ordained him first a deacon (in July) and then a priest (in August).
On October 6, 2005, Archimandrite Petru was elected Bishop of Nisporeni by the Holy Synod of the Russian Orthodox Church and appointed as a vicar of the Eparchy of Chișinău.
Due to disturbances within the eparchy the Russian Orthodox Holy Synod decided in March 2007 to temporarily relieve Bishop Petru of his responsibilities, limiting him to the administration of the Hâncu Monastery and later designating him as a vicar of the Chisinau Eparchy as Bishop of Hâncu.
In December 2010 the Holy Synod restored Bishop Petru to the leadership of the Ungheni and Nisporeni Eparchy.