Four years ago, Malacanang issued a Memorandum [ to government departments with regard to the handling of the burning Sabah issue.
So, contrary to what many detractors of the Philippine Sabah claim, the Government of the Republic of Philippines has never recognised Malaysia's purported sovereignty over North Borneo (Sabah). The Philippines, effectively, has always maintained historical and legal rights over Sabah. The documents have also been posted on Facebook by the Philippine Sabah Claim Forum.
(NB: For easier reading, we have transcribed the PDF documents (1) Circurlar issued by then Executive Secretary Eduardo R Ermita (2) Department of Education memorandum disseminated upon receipt of Malacanang Circular hereunder.)