Trump is in talks with Russia to end the war

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To continue, it would be easier to iron out details of who keeps what and where, if no one is currently shooting.
Instead, the ceasefire is continually dangled at the end of the process like a carrot, instead of at the beginning, as a sign and action of good faith.

Zelensky stated that the U.S. satellite surveillance monitoring of both sides cannot happen immediately, so that needs to be in place before any ceasefire. Russia has proven to break many agreements in the past, so they cannot be trusted.