Adds Novak quotes in paragraphs 2 and 4, context

ST PETERSBURG, June 4 (Reuters) - Russian Deputy Prime Minister Alexander Novak said on Thursday there was rising uncertainty about global oil demand and that he had discussed this issue with Saudi Energy Minister Prince Abdulaziz bin Salman.

"We came to the conclusion that no one really knows what to expect regarding demand at the moment. In other words, uncertainty has increased," Novak said after meeting the Saudi minister at the St Petersburg International Economic Forum.

The U.S. and Israel's war with Iran, subsequent damage to Iran and its Gulf neighbours' oil infrastructure and the effective closure of the Strait of Hormuz shipping lane have caused one of the largest oil supply crises in history.

"Estimates made just a few years ago now need to be fundamentally revised," Novak said, adding that the OPEC+ group of crude oil exporters would be able to offset changes taking place in the sector.