  Recently, relative braid group actions on $\imath$quantum groups of arbitrary
finite types have been constructed by Wang and the author. In this paper, we
extend that construction to $\imath$quantum groups of Kac-Moody type. We
formulate root vectors for $\imath$quantum groups in both recursive forms and
closed $\imath$divided power forms. We show that the relative braid group
symmetries send root vectors to root vectors.
