(ANSA-AFP) - UNITED NATIONS, SEP 22 - British Prime Minister Liz Truss vowed Wednesday before the United Nations to keep up military aid to war-ravaged Ukraine until it triumphs against Russia. Truss became the latest Western leader at the UN General Assembly in New York to rail against Russian President Vladimir Putin, who hours earlier mobilized reservists in a clear sign he is in no rush to end the conflict. Putin's move only highlights the "catastrophic failure" of Russia's invasion of its neighbor, and reinforced the resolve of Western allies to back Kyiv, she said. "We will not rest until Ukraine prevails," Truss told the UN General Assembly on her first trip since taking office, noting that "new UK weapons are arriving in Ukraine as I speak." "At this crucial moment in the conflict, I pledge that we will sustain or increase our military support to Ukraine for as long as it takes." (ANSA-AFP).