Sen. Thom Tillis slammed the “cozy relationship that Putin has had with Iran over the years.”

Russia has reaped a diesel deal and an increase in U.S. pressure on Ukraine as President Trump’s political needs align with his longstanding inclinations toward Russia.

President Volodymyr Zelensky of Ukraine has condemned Mr. Trump’s decision to buy Russian diesel, saying in a social media post on Friday that “Russia will ‘repay’ the diesel with further terror and p...