Putin, however, voiced his support for Trump's summit with North Korean leader Kim Jong Un in Singapore on Tuesday.
"Vladimir Putin chose to make Russian Federation unworthy of membership in the G8 by invading Ukraine and annexing Crimea".
He emphasised that the bloc's members, which also include China, four ex-Soviet Central Asian nations, as well as India and Pakistan, were anxious about the USA move.
Though not officially on the agenda, analysts say the summit may focus on whether Iran will be allowed to become a full member state, which it has been unable to achieve while subject to United Nations sanctions.
He once again slammed Washington for its illegal decision to withdraw from the internationally recognized accord.
Trump's rejection of the global climate accord and Iran nuclear deal, supported by the European Union and Canada is going to be another flashpoint in the increasingly acrimonious relationship between Washington and its Western allies.
Rouhani hailed as constructive and important Moscow's role in implementing the nuclear deal.
Russia's President Vladimir Putin and Iranian President Hassan Rouhani met Saturday to discuss regional issues including both countries' involvement in the Syrian civil war and the USA withdrawal from a landmark nuclear deal with Iran.
British Prime Minister Theresa May, German Chancellor Angela Merkel, Canada's Prime Minister Justin Trudeau, France's President Emmanuel Macron and Japanese Prime Minister Shinzo Abe wait for U.S. President Donald Trump to join them for a family photo at the G7 Summit in Charlevoix, Que., on June 8, 2018.
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BT Group CEO Gavin Patterson is to Step Down Later in 2018
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