South Korea’s military said North Korea disrupted GPS signals from border areas for the second-straight day on Saturday, affecting an unspecified number of flights and vessel operations. Tensions between the rival Koreas have escalated as North Korean leader Kim Jong Un flaunts his advancing nuclear and missile program and engages in electronic and psychological warfare,

South Korean military officials said flight GPS signals were disrupted by North Korea for the second day in a row, according to the Associated Press. Kim Jung Un, the neighboring country’s

North Korea is causing GPS disruptions for South Korean airplanes and boats in its latest cross-border provocation, according to the Defense Ministry in Seoul.