But in the next sentence, Trump contradicted his Defence Secretary James Mattis, who had threatened to resume joint military drills between the US and South Korea as talks with North Korea stalled.
But it's far from clear how infrastructure would be defined under the United Nations sanctions, and the French rail operators told Reuters they had no plans to team up with North Korea. As CCN reported, a report out of South Korea claimed that North Korea had stolen tens of millions of dollars worth of coins from cryptocurrency exchanges.
Engineers and consultants in South Korea say they are also drawing up plans for possible rail projects with the North. But officials in Tokyo have acknowledged that to negotiate the return of Japanese abductees in North Korea, they can't exclusively rely on the Trump administration to lobby on Japan's behalf.
Following the Singapore summit, the military suspended the massive Ulchi Freedom Guardian exercise in South Korea, which involves thousands of American troops each year.
A person familiar with the discussions told Bloomberg News on Tuesday that an expected lack of gains, rather than the letter, was the reason for canceling the trip. The fact that Japan feels the need to go behind our backs to deal with North Korea is proof that we have been squeezed out of major decisions involving the security of our allies in East Asia.
Kim Jong Un publicly expressed admiration for South Korea's railways during a summit in April.
It's all China's fault, at least according to President Trump, who again blamed Beijing late Wednesday for the impasse in negotiations with Pyongyang over its nuclear and missile program. But the joint statement issued by the leaders did not touch on human rights in North Korea, including the matter of abductions.
"At the same time, we also know that China is providing North Korea with considerable aid, including money, fuel, fertiliser and various other commodities". South Korean President Moon Jae-in said this month his planned third summit with North Korea's Kim next month would be another step toward the denuclearisation of the Korean peninsula and an end to the Korean War. "This is not helpful!" he said.
"There are ongoing exercises all the time on the peninsula", Mattis said. "Part of the North Korea problem is caused by the trade disputes with China", he had said.
South Korea's defense ministry said that nothing has been decided about whether to hold "Vigilant Ace" this year.
On Friday Trump called off a trip to North Korea by Secretary of State Mike Pompeo just hours after Pompeo had announced it and publicly acknowledged for the first time that his efforts to get Pyongyang to denuclearize had stalled. The research unit said North Korea launched an effort to mine bitcoin between May and July past year, especially as a means to work around worldwide sanctions, including banking and finance sanctions. You can see this disconnect in how serious each side is taking the peace negotiations with North Korea.