Polish PM also announced he would travel to Ukraine overnight to September 18, in what can be seen as an act of defiance against Russia after European leaders narrowly escaped a drone strike on a train near the Polish-Ukrainian border early in the week Polish PM also announced he would travel to Ukraine overnight to September 18, in what can be seen as an act of defiance against Russia after European leaders narrowly escaped a drone strike on a train near the Polish-Ukrainian border early in the week