The Delhi Declaration was a document signed between the Prime Minister of India and the President of Russia in December 2002, confirming the answer as option 2. Here`s the explanation for all the options:

Option 1: The President of Indonesia. This can`t be correct as the Delhi Declaration was an agreement signed with Russia, not Indonesia.

Option 2: The President of Russia. This is the correct answer. This declaration was signed to strengthen the strategic, security, and economic relations between India and Russia.

Option 3: The Prime Minister of Cambodia. This is not correct as the Delhi Declaration was not related to Cambodia in any way.

Option 4: The Prime Minister of Laos. This also can`t be correct as the Delhi Declaration pertains to the bilateral relationship between India and Russia only.