By John Geddie LONDON (Reuters) - At 86 billion euros, Greece's latest bailout package is less than 10 percent of the sum Italy and Spain need to borrow on markets before the end of 2017. The euro zone's debt problems are far from over. With Athens offered a temporary solution, sovereign debt bankers are turning their focus to the scale of the refinancing needs in some of bloc's other indebted states as the interest rate cycle turns and the crutch of central bank bond-buying is set to be whipped away in just over a year.