There is a strong police presence in southern Germany this morning as the G7 conference gets underway.
Protesters have blocked several roads as world leaders arrive in the Bavarian Alps for the summit, while several hundred demonstrators are gathering near the security perimeter set up around the venue.
The leaders of the world's richest countries are expected to use the annual meeting to keep up diplomatic pressure on Russia over the conflict in eastern Ukraine.
US President Barack Obama's Air Force One touched down in Munich in the early hours of Sunday, for the event being hosted by German Chancellor Angela Merkel.
Mr Obama urged fellow G7 leaders to stand up to "Russian aggression in Ukraine" as he enjoyed a traditional Bavarian welcome ahead of their summit in Germany.
President Obama spoke about what is on the agenda:
The EU and US worked in concert to impose stiff sanctions on members of President Vladimir Putin's inner circle and key sectors of the Russian economy in the wake of last year's annexation of Crimea.
Greece's debt crisis and how to tackle global warming will also be on the agenda, along with a proposed trade deal between the European Union and the United States.
Iraqi Prime Minister Haider al Abadi will also be on the sidelines of the summit to discuss his country's fight against Islamic State.
UK Prime Minister David Cameron will urge fellow world leaders at the G7 to "wake up" to the risk of future disease pandemics, which could be more devastating than the Ebola outbreak.
Speaking on the eve of the summit, Mr Cameron said: "The reality is that we will face an outbreak like Ebola again and that virus could be more aggressive and more difficult to contain.
"It is time to wake-up to that threat."
He is expected to say Britain is ready to "lead the way" and work with the World Health Organisation to try to harness better global research, more drug development, and a faster and more comprehensive approach to fighting disease outbreaks.
He will announce a British programme to focus on the most threatening diseases, a requirement for UK-funded vaccine research to be shared globally, and the creation of a rapid reaction unit.
Ukraine
Mr Cameron made clear that he will also seek to use the G7 to maintain pressure on Russia over Ukraine.
Russia was also ejected from the G8 group, resulting in this year' slimmed-down summit line-up of seven.
Mr Cameron will also call for political agreement by the end of 2015 on the proposed US-EU Transatlantic Trade and Investment Partnership (TTIP).
The EU's chief negotiator said in April that talks to clinch the so-called Transatlantic Trade and Investment Partnership (TTIP) would stretch into 2016.
"We launched this at a G8 that was ours in Lough Erne in 2013," one British official told reporters.
"That was over 700 days ago, and the Prime Minister feels we should be making swifter progress."
Mrs Merkel, Mr Obama, Mr Cameron, French President Francois Hollande, Italian PM Matteo Renzi, Canadian PM Stephen Harper and Japanese PM Shinzo Abe are attending the two-day summit.
On Saturday, thousands of demonstrators packed Garmisch-Partenkirchen, a small Alpine town, to protest a wide range of causes.
The demonstration was largely peaceful, but a small group of black-clad protesters clashed with police as they marched through the town, charging at officers who responded with pepper spray.
