Efforts to halt the war in Ukraine, now approaching its fourth year, have all failed. The Trump administration is now reported to have joined Russia in drafting a new plan to end the conflict, but it would require Kyiv to cede territory and reduce the size of its army — terms Ukraine has long declared unacceptable.

As things stand, Ukraine is battered but continues to hold Russia to incremental advances. President Vladimir Putin has adapted Russia’s economy to the war and is intractable in his determination to neutralize Ukraine and secure it in Russia’s orbit.

What will it take to finally put an end to this war?

It is unclear where the new deal is headed. Here is what seven experts in the United States, Europe and Russia think needs to be done. The breadth of their imperatives — rangin

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