Ukrainian and Russian officials wrapped up a "productive" first day of new U.S.-brokered talks in Abu Dhabi, Kyiv's lead negotiator said on Wednesday, as fighting in Europe's biggest conflict since World War II raged on.

The two-day trilateral meetings come after Ukraine President Volodymyr Zelenskyy said Russia had exploited a U.S.-backed energy truce last week to stockpile munitions, attacking Ukraine with a record number of ballistic missiles on Tuesday.

"The work was substantive and productive, focused on concrete steps and practical solutions," Rustem Umerov, the head of Ukraine's ​National Security and Defense Council, wrote on X.

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