evidence: A key question now being debated within Russia’s foreign policy elite is how to restore America’s fear of nuclear escalation while avoiding a direct military clash that might spin out of control. Some Moscow hardliners advocate using tactical nuclear weapons against wartime targets to shock the West into sobriety. More moderate experts have floated the idea of a nuclear bomb demonstration test, hoping that televised images of the signature mushroom cloud would awaken Western publics to the dangers of military confrontation. Others call for a strike on a U.S. satellite involved in providing targeting information to Ukraine or for downing an American Global Hawk reconnaissance drone monitoring Ukraine from airspace over the Black Sea. Any one of these steps could lead to an alarming crisis between Washington and Moscow. [...] Last week, following a Ukrainian strike on the Crimean port of Sevastopol that resulted in American-supplied cluster munitions killing at least five Russian beachgoers and wounding more than 100, Russian officials insisted that such an attack was only possible with U.S. satellite guidance aiding Ukraine. The Foreign Ministry summoned the U.S. ambassador in Moscow to charge formally that the U.S. "has become a party to the conflict," vowing that "retaliatory measures will definitely follow." The Kremlin spokesperson announced that "the involvement of the United States, the direct involvement, as a result of which Russian civilians are killed, cannot be without consequences."