The South Korean government said Tuesday that Seoul's plan to join a U.S.-led security campaign should not affect inter-Korean relations as the first official inter-Korea talks are to be held.

Tensions grew intense as it was speculated that the Democratic People's Republic of Korea (DPRK) may force the South Korean government to choose between joining the Proliferation Security Initiative (PSI) and continuing the Kaesong Industrial Complex.

"As the Kaesong industrial complex and the PSI are not a matter of choice, we will respond to the North according to our viewpoint, " Unification Ministry spokeswoman Lee Jong-joo said in a briefing.

A government delegation was visiting Kaesong in the DPRK territory to have the first official talks since South Korean President Lee Myung-bak inaugurated.

The DPRK side offered to hold the talks last week, saying it had an important announcement to make with regard to the Kaesong complex and the South Korean worker detained there for four weeks.

The security of the detained worker is currently South Korea's primary concern, according to the spokeswoman, but another focus of the dialogue may be placed in its participation into the PSI.

The South Korean delegation is ready to explain its position if its counterpart bring up the PSI issue, the spokeswoman said.

Seoul said last week that it will announce its full participation into the PSI despite the DPRK strongly warned to take stern countermeasures if so.