Nearly a month into a union walkout, the aerospace giant withdrew its latest contract offer, and the two sides exchanged blame over the breakdown.

The union representing the striking workers criticized Boeing and said it was “hell-bent” on pushing through a “non-negotiated offer” it released to the media last month.

The latest offer included a 30% raise, which was 5% more than its last offer, and a restoration of its performance bonus.

After negotiations broke down again between striking Boeing machinists and the aerospace giant, the leader of the union representing the workers says they are prepared to play the long game.