Exclusive-Exxon signs initial agreement with Rosneft to chart possible path to recoup Russian losses, sources say

By Anna Hirtenstein, Marwa Rashad and Sheila Dang

(Reuters) -U.S. oil major Exxon Mobil and Russian state-run energy giant Rosneft have signed a non-binding initial agreement to help Exxon recoup a $4.6 billion write-down it made on its…