Donald Tusk says two saboteurs crossed border from Belarus hoping to cause divisive ‘catastrophe’

Polish authorities have identified two Ukrainian men, allegedly working for the Russian intelligence services, as the key suspects in two cases of rail sabotage, the Polish prime minister, Donald Tusk, has said.

The men are alleged to have planted a military-grade explosive device and attached a steel clamp to rail tracks in two incidents on a strategic rail route used for aid deliveries for Ukraine.