South Korean President Park Geun-hye and Australian Prime Minister Tony Abbott agreed Tuesday to bolster security and defense cooperation between the two countries as their trade ministers signed a pact to free up trade between two of the biggest Asia-Pacific economies. Abbott arrived earlier in the day from Japan, where he announced the conclusion of free trade talks with Tokyo on Monday. One of the main purposes of his two-day visit to South Korea is to sign the free trade pact with Seoul that was concluded after five years of negotiations.