Citroen XM, the Berlin Wall, and Red Square

In 1990, two Dutchmen (who else?) drove a Citroen XM from Paris to Moscow and back.  There are incredible images of old French and Soviet-era cars, the crumbling Berlin Wall, and Warsaw Pact roads before they became clogged with third-hand Audis.  And is it just me, or were the XM's tires under inflated?