Yes, vietnam and malaysia.
A waste of funds. Vietnam has no claims in the Gulf of Siam, and does not have the capacity to threaten the Thai Navy there. Cambodia's Navy is made up of Viet missile patrol boat hand me downs without missiles. The bulk of their navy is made up of riverine patrol boats armed with only 20 mm guns.
As for Malaysia; I wouldn't consider the Malaysian Navy a threat to the RTN. Thailand would put its money to better use in upgrading its air force as well as early warning systems, not so much its submarine fleet.


