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,

Attacks force shift in U.S. plan for diplomatic deal in Iran and efforts to disentangle from region.

Global air traffic has been disrupted following Israel’s strikes on Iran Friday, with several major airlines suspending flights to and from locations in the Middle East and rerouting their planes to avoid much of the region’s airspace.

U.S. aircraft carrier USS Nimitz left the South China Sea on Monday morning heading west, according to data from ship tracking website Marine Traffic, after a reception for its planned port call in central Vietnam was cancelled.

AMANEY A. JAMAL is Co-Founder and Co-Principal Investigator at Arab Barometer, Dean of the Princeton School of Public and International Affairs, and Edwards S. Sanford Professor of Politics and International Affairs at Princeton University.

Russian President Vladimir Putin and U.S. President Donald Trump have held a lengthy phone call to discuss the escalating situation in the Middle East and Ukraine peace talks.

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.

Before you fill up your tank this week, here’s what you need to know about a conflict thousands of miles away.