Next steps in X-ray exploration of the Galactic Center: from Chandra and XMM-Newton to SRG, IXPE, and beyond

Intensive exploration of the Galactic Centre region by the current generation of X-ray observatories delivered a number of key results regarding the activity record of Sgr~A$*$ and properties of interstellar medium in this extreme and dynamic environment. Further advancements will be achieved by: 1) characterization of the diffuse emission on the smallest (down to sub-pc) scales; 2) sensitive and uniform spectrally-decomposed mapping of the emission at the scales of few hundred pc; 3) measurements of the polarization properties of the diffuse emission. In this regard, we will present the new data obtained by the eROSITA telescope onboard the SRG observatory and discuss the perspectives of the planned deep observations of the Sgr A molecular complex by Chandra and IXPE. These new data will not only verify our current paradigms but also pave the way to revealing physical mechanisms behind the observed phenomena, including past activity of Sgr~A*, suppressed efficiency of star formation in the Central Molecular Zone and extended structures like the Galactic Center Chimneys and the Fermi bubbles. Future missions featuring imaging X-ray microcalorimeters would add yet another dimension to this field.