World leaders gather in New York next week for a UN General Assembly dominated by US President Donald Trump's return to the rostrum, war in Gaza and Ukraine, rising Western recognition of Palestinian statehood and nuclear tensions with Iran. "We are gathering in turbulent -- even uncharted -- waters," UN Secretary-General Antonio Guterres said a week before the 193-member world body hosts six days of speeches by nearly 150 heads of state or government along with dozens more ministers. "Geopolitical divides widening. Conflicts raging. Impunity escalating. Our planet overheating," he told reporters on Tuesday. "And international cooperation is straining under pressures unseen in our lifetimes." Headlining this year's 80th General Assembly will be Trump, who calls for slashing US funding...