The
offer
came
after
Iran
and
the
big
powers
held
an
apparently
productive
meeting
in
Istanbul
over
the
weekend.
Observers
said
many
obstacles
remain
to
any
agreement,
but
the
two
sides
described
the
talks
as
positive,
and
set
a
date
of
23
May
for
their
next
meeting
in
Baghdad.
The
latest
round
of
negotiations
has
been
described
by
US
President
Barack
Obama
as
a
last
chance
to
diplomatically
resolve
the
issue
of
whether
or
not
Iran
has
a
nuclear
weapons
programme.
The
talks
coincide
with
very
tough
US-led
sanctions,
which
have
seriously
damaged
Iran’s…