Tokyo: Reflecting the 'increasing eastern orientation' of India's foreign policy, Prime Minister Manmohan Singh arrived here tonight on a four-day official visit intended to enhance strategic ties with Japan which may give up its reservations about Indo-US civil nuclear deal.

Defence and security cooperation, short of any military alliance, will also be high on agenda of talks that Singh will have with Japanese Prime Minister Shinzo Abe here on Friday.

Singh is expected to seek Japan's support to India's aspirations for civil nuclear energy, particularly against the backdrop of recent passage of law in Washington on Indo-US civil nuclear deal.