"I'm not sure about whether Ukraine will ever be joining. As long as there's a frozen conflict on Ukrainian territory, they can't possibly join. And that's probably one of the reasons why Vladimir Putin is interested in having a frozen conflict there, so that there is no border security."

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Vladimir Putin would like to have more influence in Ukraine. He would like to have Ukraine always knocked slightly off balance so that they don't know what he might do next. He would like to demonstrate that he has more power than the Ukrainians do. And so certainly by making a frozen conflict situation where Ukraine never really has a definitive sense of sovereignty over its own territory, that's in Putin's interest.

— Kimberly Zisk Marten