VLADIMIR Putin's assassins developed a deadly poison that was used to kill Alexei Navalny, a top Russian scientist living in exile has claimed.

Vil Mirzayanov is convinced that Putin's secret service agents murdered his number one enemy with a new Novichok-style toxin.

Navalny, 47, died in Spartan Arctic penal colony Polar Wolf after he was convicted in several fabricated criminal cases as part of the Kremlin 's ruthless crackdown on dissent.

When cruel Russian tyrant Putin heard the news, he was seen to smile.

Startling new evidence has now emerged that Navalny was poisoned in his Arctic hellhole jail.

His wife Yulia Navalnaya said two Western countries have proof from tests on his biological samples , which were smuggled abroad.

First photographs show the stark cell where he

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