Russia said on Thursday that North Korea's disregard for U.N. restrictions was unacceptable and that its decision to pursue its nuclear program radically limited the chances to resume stalled six-party nuclear talks. "This radically complicates, if it doesn't in practice shut off, the prospects for resuming six-party talks," Russian Foreign Ministry spokesman Alexander Lukashevich told a briefing. This comes after North Korea repeated its threat to shut down Kaesong industrial zone, where 123 South Korean firms operate factories, if the South's government continued to insult it and worsen the situation by mentioning a possible military action against it.