Serbian President Aleksandar Vucic said Friday that a shooting and blast targeting a concert hall in the Moscow region will further escalate the conflict in Ukraine. Vucic noted that on March 7, the American Embassy urged citizens not to go shopping in malls in Moscow. “Some other embassies did the same thing later. This means that their services intercepted certain conversations, and they knew this was going to happen. In any case, this is a tragic event that will have incalculable consequences. Some will say they are Islamists, some will say Kyiv. Some will even say that Moscow did it....