Pyongyang has not responded in daily inter-Korean telephone calls that were restored two weeks ago after the sister of North Korean leader Kim Jong-un denounced Seoul and Washington for disregarding its warnings in holding their joint military drills.

The Unification Ministry said on Tuesday that its regular afternoon contacts via the liaison hotline at 5 p.m. did not go through,  adding it is closely watching the situations.
An earlier call at 9 a.m. did take place as usual. A military official also said the North failed to receive phone calls via the military lines at 4 p.m.

The two Koreas had held phone calls via both the liaison hotline and military hotlines twice daily since they restored cross-border communications lines on July 27, 13 months after North Korea severed them. 

The unanswered calls appear to be a sign of discontent on the part of Pyongyang. Earlier in the day, Kim Yo-jong blasted the beginning of preliminary South Korea-U.S. military training ahead of next week's main summertime military exercise, expressing "strong regret over the act of betrayal by South Korea."