"His use of the phrase ‘nuclear tests’ suggests actual nuclear detonations, whereas the call for tests ‘on an equal basis’ to Russia and China would be tests of nuclear weapons delivery systems. This is a major difference, and clarification by the administration is urgently needed," she said.

Russia on Thursday warned it would “act accordingly” if Washington broke a more than 30-year moratorium on testing.

Russia has deployed around 170,000 troops in Ukraine’s eastern Donetsk region where they are trying to capture the stronghold of Pokrovsk in a major push for a battlefield victory, Ukrainian President...

Since the summer, Ukraine’s long-range drone campaign has ramped up dramatically, pounding energy infrastructure across Russia and stretching Moscow’s air defenses thin.

Russia has struck Ukrainian energy facilities with hundreds of drones and missiles, killing two people, wounding children, and piling more pressure on Ukraine's fragile energy grid.

“Specialists are repairing the main pipeline of the thermal power plant damaged by the drone crash,” said regional governor Andrei Klychkov.