LONDON - Britain is still not ready to arm the Syrian opposition despite a decision by US President Barack Obama to do so, but is not ruling out the introduction of a no-fly zone or any other measure, a spokesman for Prime Minister David Cameron said on Friday."Nothing is off the table," the spokesman said when asked whether Britain would back a no-fly zone, adding that "no decision has been taken" on arming the opposition. "We are in urgent discussions with our international partners."