Answer: Saudi Arabia
Notes: India and Saudi Arabia are in talks to sign a Mutual Legal Assistance Treaty (MLAT) to obtain formal assistance from each other in investigations related to criminal cases. Saudi Arabia is only among 12 other countries that does not have either an MLAT or any other bilateral agreement with India to facilitate such investigations. India has so far signed MLATs with 45 countries. India is also in talks to finalise MLATs with Italy and Germany.
