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(Image: REUTERS/GETTY)

B-2s were used in the war-games over Nevada where two B61 unarmed nuclear bombs were dropped on targets earlier this week.

The 700-pound bombs, which date back to the Cold War but are now being upgraded, are so called battlefield nukes.

They can be used to stop a large scale invasion force.

(Image: GETTY)

A National Nuclear Security Administration (NNSA) statement said: "The primary objective of flight testing is to obtain reliability, accuracy, and performance data under operational representative conditions."

The war game comes amid growing tensions between Russia and NATO with two potential flash points in Syria and the Baltic states in Eastern Europe.

According to Estonian media, Moscow has secretly sent its deadly Iskander-M nuclear missile system on a civilian ship so it would remain undetected to the Russian enclave of Kaliningrad.

(Image: REUTERS)

US intelligence has confirmed Russia has deployed the system.

An official added: "They moved a similar missile system to Kaliningrad in 2014 for a military exercise.

"It could also be a political gesture – a show of strength – to express displeasure with NATO."

(Image: NH)

This is the latest public posturing by Putin after evacuating 40million people in a huge military drill aimed at protecting its population from nuclear war.

As revealed in Daily Star Online, the UK Government has ditched its siren system and intends to warn Britain of impending an imminent nuclear strike by text message.