Former Russian president Dmitry Medvedev has threatened Poland with the prospect of “radioactive ash” in response to remarks on the use of nuclear weapons from Polish Foreign Minister Radosław Sikorski over the weekend. Sikorski had earlier told British newspaper The Guardian how the US would purportedly react to a Russian use of nuclear weapons against Ukraine. “The Americans have told the Russians that if you explode a nuke, even if it doesn’t kill anybody, we will hit all your targets [positions] in Ukraine with conventional weapons, we’ll destroy all of them,” Sikorski told the paper. Medv…