Recent developments have opened up an opportunity to join the Subaru telescope under favourable terms. With the demonstrated success of SCExAO and HSC, and first light of the PFS nearly upon us, the immediate prospects for Subaru to make breakthrough discoveries that align well with Canadian interests are excellent. In this white paper we describe the scientific and technical (instrumentation) opportunities that a partnership with Subaru would enable. IWe highlight the important synergies with TMT, MSE and Euclid, and how a relatively small investment in Subaru can significantly enhance our ability to take advantage of those facilities. In particular, access to PFS in the decade before MSE sees first light will be critical for ensuring Canadians have the technical and scientific expertise to fully exploit, and lead, science with that next generation spectroscopic facility. The partnership also has strategic value, as it represents an important step toward building an alliance of observatories on Maunakea, which itself has the potential for dramatically increasing scientific impact and reducing costs.