KIEV, Ukraine—The European Union urged Ukraine President Viktor Yanukovych to take steps to free jailed political rival Yulia Tymoshenko if he wants to seal a free-trade and political deal with the EU, setting a deadline of Nov. 18 for "a definitive move."

Mr. Yanukovych has shown little sign of giving in to pressure to free Ms. Tymoshenko, a former prime minister, even as European leaders have warned that her imprisonment jeopardizes the proposed agreement, which he says he wants to sign.

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