North and South Korea resumed high-level reconciliation talks Tuesday for the first time since the North tested a nuclear bomb in October, paving the way for a resumption of aid to impoverished Pyongyang after it pledged to start dismantling its atomic weapons program. The meetings came as North Korea showed strong signs of commitment to its February 13 pledge at international arms talks to shut down its main nuclear reactor within 60 days in exchange for energy aid. Pyongyang has already invited the chief UN nuclear inspector to visit to discuss verification of a shutdown of the reactor. On Tuesday, the country's main nuclear negotiator, Vice Foreign Minister Kim Kye Gwan, headed for the United States for talks on following through on the landmark deal. Kim arrived in Beijing on Tuesday on his way to the US, the Chinese Foreign Ministry said. South Korea plans to focus this week's Cabinet-level talks in Pyongyang on winning a firmer North Korean commitment to carry out the nuclear deal and on measures aimed at bringing permanent peace to their divided peninsula. The chief South Korean delegate, Unification Minister Lee Jae-joung, praised the nuclear deal during an informal meeting with his North Korean counterpart, Senior Cabinet Councilor Kwon Ho Ung. "A good agreement was reached... based on the principle of equality and balance," Lee told Kwon during a 15-minute chat at his hotel in Pyongyang, according to pool reports. Kwon did not respond to the comment, the reports said. Later in the day, Lee told a welcoming dinner hosted by North Korean Prime Minister Pak Pong Ju that the two Koreas should get reconciliation projects back on track now that the "skein of thread that gave us a hard time last year" is being unwound, referring to the nuclear standoff. Pak made no mention of the nuclear issue in his speech, only stressing that the two sides should put the interests of Korean people ahead of anything else, a repeat of routine North Korean rhetoric. In Seoul, South Korean President Roh Moo-hyun said it was important to show North Korea that it would get more for abandoning its nuclear weapons than keeping them. "We have to keep sending signals that their security will be guaranteed and they could get profits through reform and openness," Roh told a news conference. Roh also said he believed North Korea would not use its nuclear weapons unless attacked first, saying it would be something "only mental patients can do." The Cabinet-level contacts, which began after the two Koreas' only summit in 2000, are the highest regular dialogue channel between the two rival states, which are still technically at war because the 1950-53 Korean War ended in a cease-fire, not a peace treaty. The dialogue process, in its 20th session, has often been overshadowed by political tensions, especially over North Korea's missile and nuclear programs. North Korea abruptly pulled out of the last talks in July in anger over the South's refusal to offer aid after the North test-fired a series of missiles. Their relations further soured after the North's October 9 nuclear test. North Korea is expected this week to renew its demand for fertilizer and rice aid. The South is widely believed to be willing to resume such shipments, but it remains unclear how much it would give. Other topics expected to be on the agenda include a resumption of reunions of families split by the heavily armed border, and tests of a train line built across the frontier. The reunions have been on hold since South Korea suspended aid last year, and a planned test of the train line was canceled last year because North Korea's military said proper security arrangements had not been made.