WASHINGTON DC – The US sanctions machine, once touted as a virtually limitless tool of economic coercion against the Kremlin, may be hitting a wall – or at least that’s the message coming from the top. Secretary of State Marco Rubio signaled frustration on Wednesday, telling Kyiv Post’s correspondent that the US is nearly “out of options” after slamming Russia’s biggest oil giants, Rosneft and Lukoil, last month. JOIN US ON TELEGRAM Follow our coverage of the war on the @Kyivpost_official .