On 8 August 2012, DSCA announced Thailand's intention to acquire the Evolved Sea Sparrow missile and associated equipment to upgrade the frigates and a Letter of Offer and Acceptance was signed with Raytheon on 14 January 2013.
Thailand's intention to acquire the Evolved Sea Sparrow missile and associated equipment to upgrade the frigates and a Letter of Offer and Acceptance was signed with Raytheon on 14 January 2013. This was what DSCA announced on 8.