has tweeted a picture of himself sumo wrestling in his latest challenge to Russian president .
The billionaire founder, 50, shared the image under a previous post in which he formally challenged the warring leader, 69, to 'single combat' to decide the fate of Ukraine.
Russia invaded its eastern European neighbor on February 24, but the campaign has stalled with Putin's forces failing to make any significant inroads - while thousands of soldiers and civilians have been killed in the process.
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