United States President Donald Trump arrived at the Helsinki airport on Sunday, on the eve of the historic summit with Russian President Vladimir Putin.

Among the topics set to be discussed between the two leaders are the possible extension and expansion of an Obama-era arms control treaty known as New START, which aims to reduce the nuclear weapon stash of both countries and is set to expire in 2021.

The alleged Russian meddling in the 2016 US elections, Syria, Ukraine, NATO and US economic sanctions are also set to be approached during the high-profile meeting.

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