WARSAW, Feb 10 (Reuters) - Polish arms group Niewiadow-PGM said on Tuesday it had signed a framework deal with U.S. defence supplier Northrop ‌Grumman on producing artillery ammunition in Poland.

The deal, ​also signed by Niewiadow units Elaboracja Niewiadow ‍and Zaklady Sprzetu Precyzyjnego ⁠Niewiadow, sets ⁠out rules for cooperation on preparation, production, certification ‌and introduction to market ​of 155-millimetre artillery ammunition, in particular for the European market, ⁠Niewiadow said.

The financial ‍terms and ​production details were not disclosed. The 155 mm shell is widely used ‍by Ukraine in its war with Russia, but has been in short supply.

"The first area of ​​cooperation is the joint production of a 155 mm ​artillery ‍shell, which is currently at an advanced stage of preparation for ​the certification process," Niewiadow said in a press release.

"(The deal) creates a basis for both the development of production in Poland and joint market initiatives in the ​area of ​​offering ready-made solutions," Adam Januszko, Niewiadow's chief executive was quoted as saying in the statement.