Remember those touchy-feely moments last week when North Korea released three American detainees to the U.S. and pledged to work with the U.S. and South Korea at a summer summit?

Maybe temper those expectations a bit.

North Korea -- showing what experts say is its usual form of gamesmanship -- threatened to withdraw from the planned June 12 summit in Singapore over what it claims are unreasonable U.S. demands for the dictatorship to denuclearize its arsenal.

And it's not too keen on the U.S. and South Korea conducting joint military drills, either, and in fact broke off additional planned talks with South Korea because of them.

" ... if the U.S. is trying to drive us into a corner to force our unilateral nuclear abandonment, we will no longer be interested in such dialogue and cannot but reconsider our proceeding to the DPRK-U.S. summit," said Kim Gye Gwan, North Korea's vice foreign minister, in The Washington Post.

.@StateDept completely blindsided by #NorthKorea sudden threat to cancel summit because of planned U.S./South Korea military exercises which the North said all along they knew would take place — Andrea Mitchell (@mitchellreports) May 15, 2018

DPRK is the abbreviation for North Korea's official name.

North Korea's latest salvo was par for the course, U.S. officials said.

"The U.S. and South Korea hold an exercise, which contains some strategic strike elements to it. U.S. officials can't seem to get on the same page regarding denuclearization and what is required of North Korea," Ken Gause, a consultant at Virginia-based consulting firm CNA, told The Post. "At some point, North Korea was going to cry foul."

In addition, North Korea offered advice to the U.S. ahead of the summer talks: Don't listen to National Security Adviser John Bolton.

"We do not hide our feeling of repugnance toward him," North Korea said in a statement attributed by state-run media to Kim Kye Gwan, the vice foreign minister.

North Korea's statement Wednesday did not directly criticize President Donald Trump or Secretary of State Mike Pompeo, who has made two trips to the North to lay the groundwork for the summit.

Instead, it stressed that North Korea welcomes Trump's position for ending the deep-rooted hostilities between their countries and concluded that if the Trump administration approaches the summit with a sincere desire to improve relations, the result will be positive.

The Washington Post and the Associated Press contributed to this report.