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While the Ukranian president said the roundtable could occur as early as Tuesday, he did not indicate whether he was open to reconsidering his decision to abandon the EU agreement last month.

In Washington, Rep. Eliot L. Engel of New York, the top-ranking Democrat on the House Foreign Affairs Committee, urged the Obama administration to take a firm stand with Ukraine’s pro-democracy and pro-European Union demonstrators

“They must know that their voices are being heard,” Mr. Engel wrote in a letter to Secretary of State John F. Kerry on Monday.

Mr. Engel called on “all parties” in Ukraine to “exercise restraint, avoid confrontation and enter into dialogue.” He also stressed that, “The U.S. must make clear that we and the international community will not tolerate the use of force against peaceful protesters.”

This article is based in part on wire service reports.