Canberra: India on Monday said its commitment to nonproliferation is "second to none' and the issue of procuring uranium from Australia will come up once it firms up an international arrangement for nuclear commerce. External affairs minister Pranab Mukherjee, who met his Australian counterpart Stephen Smith here, also said it was "too early' to refer to the issue of uranium sale as political discussions back home on implementing the Indo-US nuclear deal were still on.