Asian markets mostly gave up their early gains Tuesday and the dollar came under fresh selling pressure as trading floors become cautious ahead of Donald Trump's speech to a joint session of Congress.

The new US president hinted he would make a "big" announcement on infrastructure policy, raising hopes he will deliver on a key campaign promise.

Uncertainty surrounding the sanctions on Iran and its relations with the United States pose a risk to the oil-producing nation's economy, the International Monetary Fund said Monday.

The comments were a reference to the new sanctions the Trump administration imposed early this month on individuals and companies supporting Iran's ballistic missile program and the Revolutionary Guards military force.

South Korean retail giant Lotte agreed Monday to provide land to host a controversial U.S. missile defense system loathed by Beijing, Seoul's defense ministry said.

World stock markets diverged Monday, as a recent Trump-inspired rally showed signs of fragility.

Russian-backed separatists in Ukraine on Monday threatened to seize control of enterprises across their territories unless Kiev halts a blockade by nationalist protesters.

Saudi Arabia's Aramco will invest $7 billion in a giant Malaysian oil refinery project, Prime Minister Najib Razak said Monday, as he declared ties with the kingdom were "at an all-time high".

The deal between Aramco and Malaysia's Petronas for the $27 billion project will be signed on Tuesday, the prime minister said. 

Accusations of sexism, cut-throat management, and a toxic work environment have Uber trying to pull its image out of a skid as competition revs in the on-demand ride market.

"Experienced managers know how to prevent these kinds of problems, or make it look like there isn't a problem at all," analyst Rob Enderle of Enderle Group said while discussing Uber's travails.

In the rolling countryside of southwest England, farmer Charles Martell is tending to his rare breed of cattle while two of his dairy workers get to work making Single Gloucester cheese -- a British delicacy.

China's stock market regulator on Sunday denounced the "crocodiles" that prey on small investors, at a time when Beijing is trying to reassure retail investors following the crash of summer 2015. 

Egypt is pursuing a raft of reforms to try to revive an economy weakened by years of turmoil, but analysts say that wooing foreign investors will take time.