Washington and Moscow hailed a breakthrough deal on Saturday to put Syria's peace process back on track, including a nationwide ceasefire effective from sundown on Monday, improved aid access and joint targeting of banned militant groups.
"The agreement... is very welcome. All parties to the conflict, other than groups designated as terrorist organizations by the United Nations Security Council, must now ensure its effective implementation," Mogherini said, Reuters reported.
She also said in a statement that the EU joined others "urging the UN to prepare a proposal for political transition" to serve as "the starting point for resumption of the intra-Syrian talks."