Vietnamese carriers signed aviation deals with US firms worth $21 billion on Wednesday as President Donald Trump met with top business leaders in Hanoi ahead of his summit with North Korea's Kim Jong Un.

The Bank of England on Tuesday said it was preparing to give lenders greater access to cash borrowing in its latest move to help bring financial stability ahead of Brexit.

"The Bank will increase the frequency of existing market-wide sterling (cash loans)... from monthly to weekly over the weeks surrounding the planned EU withdrawal date," the BoE said in a statement.

The price of oil sank Monday after U.S. President Donald Trump urged the OPEC crude producers' cartel to help cut "high" prices and aid the "fragile" world economy.

U.S. President Donald Trump said Monday he expects a "signing summit" with China on trade, with negotiators "very, very close" to a deal.

Uzbekistan on Monday issued a new high-denomination banknote, saying it would facilitate big consumer purchases in a country that still shops mostly with cash.

President Donald Trump's decision to extend a deadline to escalate tariffs on Chinese imports raised cautious optimism in China on Monday and sent shares soaring.

The Shanghai Composite index jumped 5.5 percent to its highest level since last summer after Trump said "substantial progress" was made in weekend talks between the two countries regarding their dispute over China's technology policies.

As the extreme volatility of cryptocurrencies makes them difficult to depend on for day-to-day use, another type of virtual currency is gaining popularity: stablecoins.

State-owned UAE energy giant Abu Dhabi National Oil Co. on Sunday signed a $4 billion deal with U.S.-based investors BlackRock and KKR granting them a minority stake in its pipeline arm.

"Going, going, gone!" resonate the enticing chants of auctioneers in the narrow streets of a trendy Istanbul neighborhood, fascinating onlookers who are surprised, not so much by the fast pace of the bidding, but by the prices in such economically troubled times.

Huawei's chairman on Sunday shrugged of the risk that President Donald Trump could issue an executive order banning the Chinese telecom giant, saying the company could succeed without the U.S. market.