The US State Department has expressed its displeasure about Ukraine's recent attacks on the Russian port of Novorossiysk on the Black Sea that have impacted US oil interests in Kazakhstan, Kyiv's chief envoy to Washington said on Tuesday. Ambassador Olga Stefanishyna noted the US concern on the fourth anniversary of Russia's brutal invasion of Ukraine. "This reach-out was not related to encouraging Ukraine from refraining to attack Russian military and energy infrastructure. It was related to the very fact that American economic interest was affected there," Stefanishyna told reporters in Washington. "It did happen, and we have taken the note." The State Department did not immediately respond to a request for comment. The Caspian Pipeline Consortium operates a pipeline from the Caspian coast in northwest Kazakhstan to the Novorossiysk port. The pipeline handles much of the crude exports from three major Kazakh fields in which major U.S. energy companies, Chevron and ExxonMobil, hav