俄驻美大使：美方至今未说明其核试验立场

Core Points - The Russian Ambassador to the U.S., Dalchiev, stated that the U.S. has not clarified its position on nuclear testing, raising concerns about its responsible behavior [1][2] - Dalchiev mentioned that dialogue between Russia and the U.S. is stagnant but not completely halted, with ongoing contacts at various levels [2] - U.S. President Trump indicated that the U.S. would conduct nuclear tests like other countries but did not disclose whether this includes detonating nuclear warheads [2]