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

Boeing has withdrawn a contract offer that would have given striking workers 30% raises over four years after talks broke down. The manufacturer said that it had boosted its offer for union workers for take-home pay and retirement benefits during two days of negotiations.

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.