New Delhi, April 20 -- Oil prices climbed more than 5% while Asian shares also advanced Monday as a standoff between Iran and the U.S. prevented tankers from using the Strait of Hormuz.

The Persian Gulf waterway was closed again after Iran reversed a decision to reopen the strait and President Donald Trump said a U.S. Navy blockade of Iranian ports remains in effect.

U.S. benchmark crude gained 6% to $87.51 a barrel, while Brent crude, the international standard, was up 5.4% at $95.26 a barrel.

Despite renewed doubts about how soon ships will again transport the vast amounts oil the world gets from the Middle East, share prices were mostly higher in Asia. However they gave up bigger gains earlier in the session.

In Tokyo, the Nikkei 2...