The precise measurement of the CKM angle Φ3 is important to furthertest the Standard Model description of CP violation. The small values ofthe branching fractions of the decays involved in the measurement limitthe precision, hence a larger dataset has to be accumulated to improve theprecision. The Belle II experiment at the SuperKEKB asymmetric-energye+e? collider aims to collect 50 ab?1 of data, a factor of 50 more than thatof its predecessor Belle. The accelerator has been successfully commissionedin 2016 and the first physics collisions were recorded in April 2018. Thebest sensitivity to Φ3 can be achieved by harnessing all possible final statesof B → D(?)K(?) decays. With the full dataset, Belle II is expected toachieve a precision of 1?for the angle Φ3. The expected sensitivities andrediscoveries from 2018 data are presented here.
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