A senior Russian diplomat warned Thursday that increasing Western support for Ukraine could trigger an open conflict between nuclear powers. Speaking at the U.N. conference on disarmament, Russian Deputy Foreign Minister Sergei Ryabkov denounced the U.S. and its allies for openly declaring the goal of defeating Russia in a “hybrid” war, arguing that it violates their obligations under international agreements and is fraught with the war in Ukraine spilling out of control. Ryabkov warned that “the U.S. and NATO policy of fueling the conflict in Ukraine” and their ”increasing involvement in the military confrontation is fraught with a direct military...