The closure of the Polish-Belarusian border has frozen a key route for Chinese exports to the European Union, prompting Beijing to put pressure on Warsaw to reopen it and restore the freight link, which is worth €25 billion a year. Poland took the decision to close its frontier with Moscow-allied Belarus ahead of joint Russian-Belarusian military exercises, codenamed Zapad 2025, which started on Friday. Following last week’s Russian drone incursion into Polish airspace, officials said the border closure would be in force until further notice. Three freight rail crossings, one for cars and another for trucks have been shut. The...