Suggestions that Ukrainian authorities supported by Poland were behind planning and executing the sabotage attack on Nord Stream gas pipelines in 2022 are groundless, the Polish president's aide said on Sunday.Germany's former intelligence chief August Hanning told Die Welt this week he believed there were agreements between presidents of Poland and Ukraine to carry out the attack."These are completely groundless insinuations," Mieszko Pawlak, head of the international policy bureau at the office of President Andrzej Duda said when asked about the allegations by Polsat broadcaster…