Ukraine won staff backing for a $15.6 billion loan from the International Monetary Fund, setting up the first loan to a nation at war in the institution’s 77-year history. The IMF and the government in Kyiv reached a staff-level agreement on a comprehensive loan program over four years, the Washington-based lender said in an emailed statement on Tuesday. The agreement is expected to be finalized with the approval of the IMF board in coming weeks. The program will be divided into two phases. In the first, lasting 12-18 months, Ukraine will take measures to “strengthen fiscal, external, price and financial stability,” including eliminating monetary financing.