Russian President Vladimir Putin said Tuesday he is considering expelling another 155 State Department personnel from Russia, which would further escalate the diplomatic tit-for-tat with the U.S.

“So strictly speaking, the number of American diplomats in Moscow should be not 455 but 155 fewer, if we are talking about parity,” Putin told reporters at a press conference in China. “So, we reserve the right to take a new decision on the number of American diplomats in Moscow. We will not do this immediately but will see how things develop.”