Ukrainian President Volodymyr Zelensky, who arrived in Singapore on Saturday on a surprise visit to take part in the Shangri-La Dialogue security conference, has called on the states in the region to attend a peace summit hosted by Switzerland in June. He had met with both the incoming president of Indonesia, Prabowo Subianto, and the head of state of East Timor, José Ramos-Horta, to discuss participation in the Swiss conference, Zelensky wrote on Telegram on Saturday. The Ukrainian president thanked Ramos-Horta for his promise to personally attend the summit scheduled for June 15 and 16. He a…