The
50-year
production
sharing
agreement,
signed
on
the
sidelines
of
the
World
Economic
Forum
in
Davos,
marks
the
biggest
contract
yet
to
tap
shale
gas
in
Europe
and
the
largest
foreign
investment
in
the
former
Soviet
republic,
Reuters
reported.
Disputes
between
Kiev
and
Moscow
seriously
disrupted
Russian
gas
flows
via
Ukraine
in
2006
and
2009,
with
European
Union
members
Bulgaria
and
Slovakia
left
without
energy
in
the
depths
of
winter.
They
remain
at
odds
over
the
terms
of
a
2009
Russian
supply
deal
brokered
by
former
prime
minister
Yulia
Tymoshenko,
for
which
she…