The Trump administration took the unusual step of warning the Ukrainian government that its strikes on a Russian Black Sea oil facility late last year had impacted US investments in Kazakhstan, the Ukrainian ambassador to the US revealed Tuesday.

Axar.az informs, citing CNN, “We have been hearing that Ukrainian attacks to Novorossiysk affected some of the American investments which are being performed through Kazakhstan. And we have heard from Department of State that we should refrain from, from, you know, attacking American interests,” Ambassador Olga Stefanishyna said at a briefing.

Stefanishyna said she had received a demarche, which is a formal diplomatic notice, from the US State Department over the matter.

“It was related to the very fact that American economic interest was affected there,” she said. “We have taken the note on that.”