Singapore, Defence Secretary Rajesh Kumar Singh said on Saturday that he understood a BrahMos missile deal with Vietnam had already been signed, though it was probably yet to be publicly announced, while a similar pact involving Indonesia was in the final stages."My understanding is that with both Indonesia and with Vietnam, the deal is in the final stages that in fact, for Vietnam, I understand that it has already been signed, probably not publicly announced, but it's already been signed," Singh said in Singapore, while answering a question on potential buyers of the missile system at the Shangri-La Dialogue.The Philippines,…