By Wayne Cole and Alun John SYDNEY/LONDON (Reuters) -World shares nudged up on Monday, helped by oil walking back some of last week's increase, though the conflict between Israel and Iran remained a concern,

Iranian missiles damaged the US embassy in Tel Aviv, escalating tensions. Israel retaliated with strikes on Iran's energy sector, while both sides continued attacks.

This latest iteration of the Middle East crisis is both familiar and unfamiliar. We’re all back obsessing about the oil price, yet we also know from the last few years that that same oil price has appeared somewhat impervious — oblivious?

The costs of chartering tankers to move oil from the Middle East to Asia have climbed and ship bookings have slowed as the Israel-Iran conflict fuels worries of potential disruptions, industry sources told Reuters on Monday.

The price of Dubai swaps, which is a contract settled against physical prices of Dubai crude, rose 5.8% on June 13 to end at $71.03 a barrel. The gain of $3.86 a barrel for Dubai swaps contrasts with the $4.87 jump for Brent contracts.

Oil supplies from the Middle East face increasing risk as the conflict between Israel and Iran drags on, according to RBC Capital Markets LLC, which warned that energy is now “clearly in the crosshairs.

U.S. investors on Friday sought refuge in safe-haven assets like the dollar and gold, as oil prices surged after Iran retaliated against Israel's biggest-ever military strike against the major crude producer.