Russia may abandon the deal altogether by ramping up oil production in a move which puts the state on a collision course with Saudi Arabia, he warned.
For the de facto leader of Opec, a stable market is critical as the kingdom ramps up a major overhaul of its economy with the planned listing of state-backed oil producer Saudi Aramco as one of the cornerstones of reform, according to JP Morgan.
"Any large swings in oil prices could be seen as a risk to the implementation of this vision as the economy is still very much dependent on oil revenues," the bank said.
The risk of a diplomatic breakdown is unwelcome for the Saudis, who are embroiled in tense internal political wranglings. Global oil prices broke above two-year highs last week in the wake of a shock anti-corruption purge of Saudi royals and senior officials.