With less than three weeks to go before the first-ever planned U.S.-North Korea summit, both sides are engaging in a delicate diplomatic dance, claiming that the landmark event might not even be held while also serving up concessions to draw the other back to the negotiating table.

The see-sawing odds of the meeting between North Korean leader Kim Jong Un and U.S. President Donald Trump took a turn for the worse Tuesday when the American leader, hosting his South Korean counterpart, Moon Jae-in, said "there's a very substantial chance it won't work out."

"There are certain conditions that we want, and I think we'll get those conditions," Trump said. "And if we don't, we don't have the meeting."