Bad news for a fragile US-brokered peace deal — Israel signals it won't stop fighting in Lebanon, risking a slide back into war.

• A new US-Iran memorandum demands an end to fighting on all fronts, including Lebanon, but Netanyahu says Israeli troops are staying in southern Lebanon.
• Lebanon is a red line for Iran, so refusing to leave there could blow up the whole deal.
• Israel is still hitting Lebanon hard, reportedly dropping white phosphorus bombs on Nabatiyeh.
• The fear: Israel pushes hard enough to provoke an Iranian response and drag the US back into the war.
• Both Israel and the US are running low on missile interceptors, raising worries about how far Israel might go if it starts losing.

Outlook: Expect continued Israeli strikes in Lebanon and a tense standoff over whether Trump holds the line or gets pulled back into the conflict.