New Delhi, Aug. 6 -- President Donald Trump surprised reporters Tuesday by appearing on the White House roof, joking about installing "nuclear missiles" while surveying construction plans.

Flanked by snipers and architects, Trump spent 20 minutes walking above the press briefing room, waving at journalists below. When asked what he planned to build, he chuckled and mimicked a missile launch with his arm.

The stunt came amid rising tensions with Russia after Trump ordered two nuclear submarines repositioned last week.

Trump's missile quip wasn't entirely random. Days earlier, he deployed submarines after Medvedev referenced Russia's "Dead Hand" nuclear system, hinting at catastrophic retaliation.

Though Medvedev holds no real power tod...