The way that will require the least force is to soak the thing in WD-40 and let it sit overnight. If the links are all flexible then you can lube it with some oil and get back on your way. If it stays frozen, or is damaged in some other way you will need the chain breaker tool as noted above.
If you take the old chain off to replace with a new one, don't discard the old chain until you've used it to measure out the length of the new one.
Good luck!
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