World markets slumped Thursday as the arrest of a top executive at Chinese telecoms giant Huawei raised doubts over the recent trade truce agreed by U.S. President Donald Trump and Chinese counterpart Xi Jinping.

China said Thursday it would "immediately" implement measures agreed under a trade war truce with the United States.

OPEC members and other oil-producing countries mulled cuts in output Thursday to prop up plunging prices, defying repeated calls by US President Donald Trump that they keep the taps open. 

Nissan plans to conduct another recall owing to "improper" tests on new vehicles, a newspaper said Thursday, dealing a fresh blow to the Japanese car giant following the shock arrest of former chairman Carlos Ghosn.

The EU commission on Wednesday presented its plan to reduce the dollar's overwhelming dominance of the global economy and to strengthen the role of the euro, particularly for energy transactions.

Russian President Vladimir Putin on Wednesday voiced support for Venezuelan leader Nicolas Maduro as he visited Moscow seeking financial assistance for the socialist country's collapsing economy.

Tensions between Ukraine and Russia off the coast of Crimea are affecting EU economies as European vessels are caught up in delays, the bloc's diplomatic chief warned Wednesday.

The former Nissan chairman Carlos Ghosn, who was arrested in Japan on suspicion of underreporting his income, seems prepared to fight out his case and has asked for thriller books, according to the Brazilian consul general.

Joao de Mendonca Lima Neto, one of the few visitors Ghosn has been allowed to see under Japan's stringent rules, said Ghosn was healthy and holding up well.

China vowed Wednesday to move swiftly to strike a trade consensus with the United States, even as mixed signals on the detente from self-described "Tariff Man" Donald Trump's administration upset global markets.

EU finance ministers agreed reforms to better fight against a financial crisis on Tuesday that fell short of the original ambitions to relaunch Europe by French President Emmanuel Macron.