The United States has warned North Korea against any "provocative acts" following the execution of leader Kim Jong-Un’s uncle

The United States has warned North Korea against any "provocative acts" following the execution of leader Kim Jong-Un's uncle.
  
Washington also sought to step up talks with its Asian allies, voicing concern over regional stability after Jang Song-Thaek -- seen as Kim's political regent and the country's unofficial number two -- was executed on Thursday following a special military trial.
  
"Certainly, it's something we're concerned about, and we would urge the North Koreans not to take provocative acts, not to do so going forward, because it's not in the interest of regional stability," US State Department spokeswoman Marie Harf said on Friday.
  
The comments came after South Korea's defense chief Kim Kwan-Jin pledged to increase military vigilance against any potential provocations, saying the stunning purge indicated Kim Jong-Un's firm resolve to tighten his grip on power.
  
"We will heighten readiness against North Korea as (Jang's execution) can lead to provocations against the South," he said in the parliamentary defence meeting on Friday. "This case can be seen as part of the reign of terror by Kim Jong-Un as he is seeking to consolidate his power with an iron fist."