Former Vice President Joe Biden has levelled a fresh attack against President Donald Trump for his perceived closeness to Russia, suggesting he is under the control of Russian President Vladimir Putin "like a puppy."

Axar.az reports citing foreign media that during a fundraising video call Tuesday, presumptive Democratic presidential nominee Biden attacked Trump for his apparent failings on foreign policy and his handling of the COVID-19 coronavirus pandemic, cases and deaths from which are accelerating rapidly across the U.S.

Biden—who is leading Trump in opinion polls nationwide, including in the swing states that will likely decide the November election—accused Trump of "coddling Putin," a prominent criticism of the president among his opponents during his time in office.

"Putin carries him around like a puppy in one of those little puppy cages," Biden said, according to a pool report sent out by the former vice president's campaign team.