Iranian Foreign Ministry spokesperson Nasser Kanaani said "no specific development came about recently" in regard to Iran-Russia military technology ties.
A senior Ukrainian intelligence official suspected Russia itself was behind the attack, while a former senior U.S. intelligence officer doubted that theory.
"Western allies could have isolated the far-right, but blew it by delegitimizing all this as conspiracy theories and propaganda," former State Department analyst Jonathan Brunson told Newsweek.
A senior administration official said "territorial integrity and respect for sovereignty" are "fundamental principles on which" the U.S. and China "have a very shared basis and view."