The document was signed by defense ministers of the three countries Stepan Poltorak, Antoni Macierewicz and Raimundas Karoblis in Lublin, an Ukrinform correspondent reports.
"This agreement changes the form of the brigade. From now on, the brigade will be able to take part in activities, holding of which is necessary when the peace is under threat. It is a good sign that will allow our peoples, primarily the brigade, to act for the sake of security of Central and Eastern Europe," Polish defense minister Macierewicz said.
He stressed that the brigade was an example of the path which the three peoples choose: the path of unity in opposing enemies, the path of mutual assistance.
"Today we want and we will help Ukraine, which was attacked by Eastern imperialism, for the sake of securing peace, cooperation and good future for our peoples," Macierewicz stressed.
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