A Trump-Putin meeting has been floated by both sides for some time.

When the two men do meet on August 15, one apparent American objective is a trilateral summit with Ukrainian President Volodymyr Zelensky to discuss an end to the war.

Still, the summit – which has been floated before and delayed before – raises the question of how the war might end.

Here are five possible scenarios:

1. Putin agrees to an unconditional ceasefire – Highly unlikely. It’s improbable that Putin would agree to a ceasefire in which the front lines stay as they are – the United States, Europe and Ukraine already demanded such a pause in May, under the threat of sanctions, and Russia rejected it.

2. Pragmatism and more talks – The talks could agree on more talks later, that seal in Russian gains when winter sets in, freezing the front lines militarily and literally around October.

3. Ukraine somehow weathers the two years ahead – In this scenario, US and European military aid to Ukraine helps them minimize concessions on the front line in the coming months, and leads Putin to seek to talk, as his military have yet again failed to deliver.

4. Catastrophe for Ukraine and NATO – Putin could correctly see the cracks in Western unity after a summit with Trump that improves US-Russian relations but leaves Ukraine to fend for itself.

5. Disaster for Putin: a repeat of the Soviets in Afghanistan – Russia could blunder on, expending thousands of soldiers’ lives a week, for relatively small gains, and seeing sanctions erode his alliance with China, and revenue from India.

Read more on the five ways the war could end here.