* Falling oil price and maintenance boost refining margins
Oct 31 - Chevron Corp posted a higher-than-expected quarterly profit on Friday as lower crude prices boosted its refinery operations, helping to offset sagging oil and gas production.
* Debt dispute between Gazprom, Naftogaz left to arbitration (Adds Yatseniuk, Kremlin, other detail)
Oct 31 - Exxon Mobil Corp, the world's largest publicly traded oil company, on Friday reported a better-than-expected 3 percent increase in quarterly profit on higher results in its refining and chemicals businesses.
KIEV, Oct 31 - Ukrainian Prime Minister Arseny Yatseniuk, speaking after a gas agreement with Russia was nailed down, said on Friday Ukraine would guarantee deliveries of gas through its territory to Europe to make sure Moscow had no room for "blackmailing".
No related earnings announcements are currently scheduled within the next 7 days.