The U.S. Treasury Department on Tuesday imposed sanctions on more than 20 companies in a network that it said has long sent Iranian oil to China, days after negotiators from Iran and the United States concluded a fourth round of nuclear talks.

President Donald Trump said Monday the tariffs against China would "go up substantially higher" than 145% if a longer-term trade deal is not reached before 90 days.

DUBAI (Reuters) - Recent U.S. sanctions on Iran are not constructive when it comes to negotiations, Iran's foreign ministry spokesperson Esmaeil Baghaei said on Tuesday, after the two countries held a fourth round of nuclear talks on Sunday in Oman.

French President Emmanuel Macron said on Tuesday he was in favour of imposing new sanctions on Russia in the coming days if Moscow failed to respect a ceasefire, mentioning financial services and oil and gas as possible targets.

A leading economist has been telling EU finance ministers that Russia’s economy is under growing strain as its invasion of Ukraine drags on.