KYIV: Russian drone attacks near the Polish border, including on a Warsaw-bound train, are an “escalation” in the war by Moscow, Poland’s foreign minister Radoslaw Sikorski said in Kyiv Sunday, calling to “double” support for Ukraine. “This is an escalation, this is another great challenge for Ukraine and for the hypothetical future victims of Russian aggression, and this means that we should double our efforts to support victims of aggression,” Sikorski told a press briefing.