US President Joe Biden

Biden raises election meddling with Putin in first phone call

The conversation included a discussion about the ongoing opposition protests in Russia and an extension of the last remaining US-Russia nuclear arms pact.

Mr Putin congratulated the new US president on winning the election, according to a Russian statement.

Both parties said they agreed to maintain contact moving forward.

Former US President Donald Trump sometimes undercut his own administration's tough posture on Russia and was accused of being too deferential to Mr Putin.

New US president sworn in amid Trump snub

"Democracy has prevailed," he said after taking the oath of office from Chief Justice John Roberts.

Donald Trump - who has not formally conceded the presidency to Mr Biden - snubbed the inauguration ceremony, in a departure from longstanding precedent.

The new president has announced a raft of measures reversing Trump policies.

Kamala Harris was sworn in as vice-president ahead of Mr Biden. She is the first woman - and the first black and Asian-American person - to serve in a role, a heartbeat from the presidency.