Fresh activity emerges at Iran’s deeply buried nuclear site as Trump warns Iran not to ‘get cute’

New satellite imagery shows Iran has added new defenses around tunnel entrances at Pickaxe Mountain, the deeply buried nuclear-linked site President Donald Trump has repeatedly threatened to strike, as Russia and China on Thursday vetoed a U.S.-drafted Security Council resolution aimed at preserving international monitoring of sanctions on Tehran.

The Institute for Science and International Security said in a report released Thursday that satellite imagery from Sept. 11 shows earthen roadblocks...