US President Donald Trump said he would “work on the Taiwan problem” and speak with Taiwan’s president after his recent meeting with Chinese leader Xi Jinping. Trump also said it was “good” that Xi had met Russian President Vladimir Putin in Beijing.Xi and Putin met in the Chinese capital on Wednesday, while Trump visited Beijing last week. Xi and Putin signed more than 40 cooperation agreements covering trade, technology and media exchanges. Both leaders hailed their ties as being at their strongest point in history and pledged deeper cooperation in energy and artificial intelligence.