By Soo-hyang Choi SEOUL (Reuters) -Poland signed an agreement on Wednesday to buy 288 artillery rocket launchers in its latest arms deal with South Korea, following shipments of tanks and howitzers, as it ramps up weapons imports after Russia’s invasion of Ukraine. The first 18 of the Chunmoo rocket launchers will be delivered as soon as 2023 to protect eastern Poland, Defence Minister Mariusz Błaszczak said. The weapons are made by Hanwha Defense, the defence unit of South Korea’s Hanwha Corp. The agreement comes as South Korean companies shipped the first batch of tanks and howitzers to Pola…