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Vladimir Putin shakes hands with Joe Biden during their meeting in Moscow on Mar 10, 2011. (File photo: Reuters/Alexander Natruskin) - 

The United States will stand with its European allies against Russia, President Joe Biden has promised ahead of the first face-to-face meeting with Vladimir Putin of his administration.

Biden will head to Europe on Wednesday (Jun 9), and is set to attend both the G-7 and NATO summits as well as holding a high-stakes meeting with the Russian leader in Geneva on Jun 16.

In an op-ed for the Washington Post published Saturday, the US president promised to shore up Washington's "democratic alliances" in the face of multiple crises and mounting threats from Moscow and Beijing.

"We are standing united to address Russia's challenges to European security, starting with its aggression in Ukraine, and there will be no doubt about the resolve of the United States to defend our democratic values, which we cannot separate from our interests," he wrote.

"President Putin knows that I will not hesitate to respond to future harmful activities," he said. "When we meet, I will again underscore the commitment of the United States, Europe and like-minded democracies to stand up for human rights and dignity."

Since taking office in January, Biden has ramped up pressure on the Kremlin, and his comments likening Putin to a "killer" were met with fierce criticism in Moscow.

But both leaders have expressed hopes that relations can improve, with the Russian president saying Friday he expected a "positive" result from the talks.

Biden in his weekend op-ed also stressed that Washington "does not seek conflict" - pointing to his recent extension of the New START arms reduction treaty as proof of his desire to reduce tensions.

"We want a stable and predictable relationship where we can work with Russia on issues like strategic stability and arms control," he wrote//CNA