I don't see this conflict going nuclear. Partly that's because all sides in a nuclear war lose, leaving the neutral nations to run the world afterwards -- thus Biden's handlers will be aware that if they start lobbing nukes at Russia and China, that guarantees the end of the US as a nation and hands the future over to India and Brazil. Partly, though, it's because the Russians are being very canny. They seem to have realized that they can win this by maintaining slow, steady pressure on Ukraine and NATO, never giving anyone an excuse to escalate, while bleeding Ukraine's military and NATO's economies dry. If you're concerned to prevent the risk of nuclear war, prayer is certainly a good choice.