Working-level negotiations between the U.S. and North Korea in Stockholm, Sweden this weekend have failed to produce a deal, Pyongyang’s chief negotiator said on Saturday.

In a statement following a day of talks with American counterparts at the Villa Elfvik Strand conference center just north of Stockholm, Kim Myong Gil said the U.S. had not been able to provide the DPRK with the new “calculation” demanded by Pyongyang in recent months.

“The breakdown of the negotiations without producing any results is entirely due to Washington’s failure to abandon its outdated stance and attitude,” Kim said in comments outside the DPRK embassy