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We present the first results from a JWST program studying the role played bypowerful radio jets in the evolution of the most massive galaxies at the onsetof Cosmic Noon. Using NIRSpec integral field spectroscopy, we detect 24rest-frame optical emission lines from the $z=3.5892$ radio galaxy 4C+19.71.4C+19.71 contains one of the most energetic radio jets known, making it perfectfor testing radio-mode feedback on the interstellar medium (ISM) of a$M_{\star}\sim10^{11}\,\rm M_{\odot}$ galaxy. The rich spectrum enables lineratio diagnostics showing that the radiation from the active galactic nucleus(AGN) dominates the ionization of the entire ISM out to at least $25\,$kpc, theedge of the detection. Sub-kpc resolution reveals filamentary structures andemission blobs in the warm ionized ISM distributed on scales of $\sim5$ to$\sim20\,$kpc. A large fraction of the extended gaseous nebula is located nearthe systemic velocity. This nebula may thus be the patchy ISM which isilluminated by the AGN after the passage of the jet. A radiatively-drivenoutflow is observed within $\sim5\,$kpc from the nucleus. The inefficientcoupling ($\lesssim 10^{-4}$) between this outflow and the quasar and the lackof extreme gas motions on galactic scales are inconsistent with other high-$z$powerful quasars. Combining our data with ground-based studies, we concludethat only a minor fraction of the feedback processes is happening on $<25\,$kpcscales.

JWST discovers an AGN ionization cone but only weak radiative-driven feedback in a powerful $z$$\approx$3.5 radio-loud AGN