  The environmental influence of cluster media on its member galaxies, known as
Butcher--Oemler effect, has recently been subject to revision due to numerous
observations of strong morphological transformations occurring outside the
cluster virial radii, caused by some unidentified gas removal processes. In
this context we present new XMM-Newton observations of M86 group. The unique
combination of high spatial and spectral resolution and large field of view of
XMM-Newton allows an in-depth investigation of the processes involved in the
spectacular disruption of this object. We identify a possible shock with Mach
number of ~1.4 in the process of crushing the galaxy in the North-East
direction. The latter is ascribed to the presence of a dense X-ray emitting
filament, previously revealed in the RASS data. The shock is not associated
with other previously identified features of M86 X-ray emission, such as the
plume, the north-eastern arm and the southern extension, which are found to
have low entropy, similar to the inner 2 kpc of M86. Finally, mere existence of
the large scale gas halo around the M86 group, suggests that the disruptions of
M86's X-ray halo may be caused by small-scale types of interactions such as
galaxy-galaxy collisions.
