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This White Paper details the intentions and plans of the East Asian Very LongBaseline Interferometry (VLBI) community for pushing the frontiers ofmillimeter/submillimeter VLBI. To this end, we shall endeavor to activelypromote coordinated efforts in the East Asia region. Our goal is to establishfirm collaborations among the East Asia VLBI community in partnership withrelated institutes in North America and Europe and to expand existing globalmm/submm VLBI arrays for (a) exploring the vicinity of black holes with anultimate angular resolution down to 1~R$_{S}$ (Schwarzschild radius) and (b)investigating the dynamics of circumstellar gas in star-forming regions andlate-type stars, and circumnuclear gas around active galactic nuclei (AGNs). Inthe first half of this White Paper, we highlight scientific accomplishments ofthe East Asia (EA) VLBI community. Various VLBI research results on M87, SgrA*, blazars, narrow-line Seyfert~1 galaxies, and compact symmetric objects aredescribed, and future visions of our VLBI science are briefly presented. Maserscience of star formation, stellar evolution, and physics of accretion disksaround AGNs are also discussed. A new vision for conducting multi-transitionmaser studies using mm/submm VLBI together with the Atacama LargeMillimeter/Submillimeter Array (ALMA) is described. In the second half of thisWhite Paper, we describe the EA community's vision for using mm/submm VLBIarrays in the framework or extended version of the Event Horizon Telescope(EHT) and the Global Millimeter VLBI Array (GMVA). The accomplishment of theaforementioned goal will maximize the overall scientific outcomes of mm/submmVLBI in the world.

White Paper on East Asian Vision for mm/submm VLBI: Toward Black Hole Astrophysics down to Angular Resolution of 1~R$_{S}$