Merz vows to tackle illegal migration as he meets Donald Tusk in first trip to Poland as chancellor / Poland's PM Donald Tusk says his party's computer systems targeted in cyberattack / Polish PM & ex-EU chief Donald Tusk says he dreams of UK making 'BRETURN' to Europe as Keir lobbies from 'Brexit reset' / Polish PM Donald Tusk accuses Russia of planning acts of terrorism against airlines around the world / Poland PM Donald Tusk accuses Russia of global 'air terror' plot / Donald Tusk says Poland will shield Netanyahu from arrest at Auschwitz / Ukraine peace talks possible this winter, says Donald Tusk / Poland's Prime Minister Donald Tusk says negotiations over the war in Ukraine could start 'in the winter' / Poland's Prime Minister Donald Tusk visits defensive fortifications on border with Russia / Donald Tusk's party chooses Warsaw mayor as presidential candidate