In an address to OSCE Parliamentary Assembly, the organisation's Chairman-in-Office Zbigniew Rau, who also serves as Poland's Minister of Foreign Affairs, said "the Russian aggression against Ukraine, supported by Belarus, calls into question our European security system that was built after the end of the Cold War". He added that the international community had thought Russia's "immoral and barbaric instruments for waging war belonged to the past". "Sadly, we were wrong," Rau said.