World leaders have said they are looking forward to work with Joe Biden, sworn-in as US President after four turbulent years under Donald Trump. 

Prime Minister Imran Khan in a tweet, congratulated the Joe Biden on his inauguration and said that Pakistan is looking forward to work with US President Joe Biden in building a stronger Pak-US partnership through trade and economic engagement, countering climate change. 

President of the European Council, Charles Michel, tweeted congratulations to Biden and said it is a time to bring back conviction & common sense and rejuvenate our EU-US relationship.

Russian Kremlin spokesman Dmitry Peskov said Russia would seek good relations with the United States.

China has congratulated US President Joe Biden on his inauguration and called for a reset in relations between Beijing and Washington.

Chinese foreign ministry said Beijing welcomes news that the US would rejoin the World Health Organizaion and Paris climate accord as Biden tried to pivot his office back to a key role in global leadership. 

German Chancellor Angela Merkel, Japanese Prime Minister Yoshihide Suga, Palestinian President Mahmud Abbas  also have congratulated Biden on his inauguration.

Irani President Hassan Rouhani hailed the departure of "tyrant" Trump, Tehran having repeatedly called on Washington to lift sanctions imposed over its nuclear drive.