This chapter explores the multifaceted relationships between East Asian diasporas and their homelands through historical, political, economic, and cultural lenses. Focusing on Chinese, Japanese, and Korean diasporic experiences, it traces the evolution of diaspora formation through colonialism, war, and economic migration. The chapter interrogates how diasporic communities sustain ties with their origins—materially, symbolically, and politically—while simultaneously negotiating identity, belonging, and citizenship in host societies. It highlights the dual role of diasporas as agents of both connection and contestation, shaped by generational shifts, digital mobilities, and national strategies of engagement. State-led policies, cultural diplomacy, and diaspora-driven initiatives form a complex web of reciprocal and at times, conflicting interests. Through comparative analysis, the chapter illuminates how diasporas are not static remnants of migration but dynamic actors shaping and reshaping notions of home, nationhood, and transnationalism in the twenty-first century.