Interior Minister Marcin Kierwiński said the frontier will only reopen once authorities are certain there is no danger. The move affects major transit points for Chinese exports to the EU, worth some €25 billion annually, and analysts say Warsaw is using the closure as leverage to pressure Minsk through Beijing. <br><br> Foreign Minister Radosław Sikorski noted that if China intervenes, as it did earlier this year, the border could reopen sooner.