The
US
has
already
exempted
a
number
of
major
countries
from
the
new
sanctions,
which
it
may
impose
starting
on
28
June
as
Washington's
most
ambitious
measure
yet
to
force
Iran
to
curtail
its
nuclear
programme
by
reducing
its
oil
export
sales.
China,
which
alone
buys
as
much
as
a
fifth
of
Iran's
crude
exports,
has
not
yet
been
granted
a
similar
reprieve,
but
US
Secretary
of
State
Hillary
Clinton
hinted
on
Wednesday
that
one
could
be
in
the
works,
Reuters
reported.
"We've
seen
China
slowly
but
surely
take
actions,"
Clinton
said
in…