NEWPORT, Wales, Sept 4 (Reuters) - Ukrainian President Petro Poroshenko said he was cautiously optimistic about a meeting on Friday aimed at ending the conflict in Ukraine.
Poroshenko has said he would order a ceasefire on Friday, provided a planned meeting in Minsk of envoys from Ukraine, Russia and Europe's OSCE security watchdog went ahead.
Speaking at a news conference at a NATO summit, Poroshenko voiced "careful optimism" about the meeting.
NATO Secretary-General Anders Fogh Rasmussen said the world "must respond determinedly if Russia were to intervene further in Ukraine -- respond through deeper, broader, tougher economic sanctions that would definitely hurt the Russian economy and isolate Russia further." (Reporting by Adrian Croft; Editing by Guy Faulconbridge)