Curious how this is being framed or spun as a war (sic) between Russia and Saudi Arabia.
The best thing to do right now is to let the oil price crash and while you are it, bump up volume to make sure it crashes and stays down. This is the best strategy for OPEC+ on the assumption that OPEC+ wish to maximize the net present value of cash flow/net revenues going forward and is not obsessed with the near-term cash flows and the state of the balance sheet.
OPEC has never been able to prevent oil prices from going where they want to go. OPEC has only had some success stabilizing oil prices for periods of time.
Sub-US$30/bbl oil (Brent) for any length of time will hammer North American unconventional producers and many offshore ventures. That will make it much easier for oil to move back to US$70/bbl once the current pandemic is over.