The PNȚ and the PNL welcomed Romania's participation in the Nazi attack on the Soviet Union, since it returned Bessarabian lands to Romania. However, both parties protested when Antonescu gave the order to advance beyond interwar borders and annex Transnistria. This period also signaled Romania's participation in the Holocaust, heralded by the Iași pogrom. These crimes were also vocally condemned by the PNȚ and the PNL in letters to Antonescu. Maniu still refused to believe that Antonescu had a genocidal agenda and, when interviewed by American diplomats, played down the pogrom's importance. By 1942, having been informed that Britain and the US intended to assess and punish all antisemitic crimes, he told Romanian ministers that the deportation of Bessarabian Jews risked destroying Romania; Mihalache also added his input, describing deportations as "alien to the humanitarian traditions of our people." Antonescu largely tolerated such insubordination, but also curbed it at regular intervals. In August 1942, he threatened to "castigate in due course" Maniu and others who opposed "cleansing this nation totally of the [Jewish] blight."