Richard Engel has been NBC News' chief foreign correspondent since 2008.
"They didn't expect this decision. It's out of their hands, and they are constantly apologizing for it."
ISIS claimed responsibility for the attack, which came just weeks after President Trump said "we have beaten them and we have beaten them badly."
"I'm from the United States, from Texas. They like to execute people, too. So I really don't see any difference," he said in an exclusive interview.
Natalia Veselnitskaya was at the 2016 Trump Tower meeting convened after Trump campaign officials were promised dirt on Hillary Clinton.
Petro Poroshenko warned Russia would "pay a huge price" if they invaded Ukraine.
The businessman, who donated $273,000 in 2016, wanted a face-to-face meeting with a Russian official.
An NBC News investigation reveals a business intelligence company with governmental contracts and a special department for politically motivated work.
"We're on the two-yard line," one U.S. special forces commander told NBC News. "We're that close and now it's coming apart."
"Something is probably going to happen," Boris Karpichkov says his old friend told him. "It's very serious, and you are not alone."
"We have stronger evidence than we had for any past conflicts, any past tribunals."