WATCH: Russian President Vladimir Putin brings his own mug to G20 Summit official dinner, toasts with US President Trump

Russian President Vladimir Putin brought and drank from his own mug during an official dinner at the G20 summit in Osaka's Japan, prompting social media jokes and speculation that the longtime leader suffered from paranoia.

Videos showed Putin, in power for almost twenty years, drinking from a white thermos mug while other leaders drank from regular wine glasses.

"This is because he is constantly drinking tea from that thermos," Putin's spokesman Dmitry Peskov explained to the RIA Novosti news agency.

The Russian president was seen toasting US President Donald Trump with the mug.

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Trump drank a dark liquid that appeared to be cola from a wine glass.

Putin bringing his own cup to the international event prompted speculation online that the 66-year-old did not trust anyone.

"If you've seen what I've seen, you'd bring your own cup too," a parody account of the Russian leader, @DarthPutinKGB, wrote on Twitter.

The mug resembled one that Putin has drunk from during his annual hours-long press conferences that has a double-headed eagle, Russia's national symbol, on it.

PM Modi held a 'RIC' trilateral meet with Chinese President Xi Jinping and Russian President Vladimir Putin on the first day of the G20 Summit wherein they discussed issues like terrorism and climate change. 

The three countries, in a joint communique of the 16th Meeting of the Foreign Ministers of Russia, India, and China, strongly condemned terrorism in all its forms and manifestations.

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In his opening remarks, Prime Minister Modi said that the trilateral meeting in Osaka is a useful medium of discussion and coordination on major global issues.

After a long time, the three leaders met in Argentina at the summit level last year.

"As the world's leading economies, the exchange of views between us, on the economic, political and security situation of the world, is important. Our trilateral meeting today is a useful medium of discussion and coordination on major global issues.

(With AP inputs)