I would use "at peace" in both of your examples. I think "at peace" is more of a state of mind, while "in peace" suggest that no external force is disturbing you. We hope that countries might co-exist in peace instead of in conflict.
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KhoffI would use "at peace" in both of your examples. I think "at peace" is more of a state of mind, while "in peace" suggest that no external force is disturbing you.
We hope that countries might co-exist in peace instead of in conflict.
"Rest in Peace" is often written on gravestones -- once a person dies, nothing can ever disturb him again.