The United States will seek to enforce the UN resolution sanctioning North Korea following its recent provocative moves, Vice President Joe Biden said on Sunday.
"We are going to enforce the UN resolution," Biden told NBC television in his home state of Delaware. "North Korea is a very destabilizing element in east Asia."
"It is important that we make those sanctions stick," Biden stressed.
He said that while it was not necessarily possible to determine Pyongyang's motivations: "We can't guess his motivations; we have to deal with the reality."
Pyongyang on Saturday vowed to build more nuclear weapons and to start enriching uranium for a new atomic weapons program following the UN Security Council's unanimous vote on Friday to impose tougher sanctions for Pyongyang's nuclear test.
US Secretary of State Hillary Clinton, calling North Korea's actions "deeply regrettable," responded that the United States would do "all we can" to halt Pyongyang's nuclear proliferation.