The United States removed sanctions on Burma over the past decade based on progress toward democracy,” Biden said in a statement. “The reversal of that progress will necessitate an immediate review of our sanction laws and authorities, followed by appropriate action. The United States will stand up for democracy wherever it is under attack.”
"The United States opposes any attempt to alter the outcome of recent elections or impede Myanmar's democratic transition, and will take action against those responsible if these steps are not reversed," White House spokeswoman Jen Psaki said in a statement.
Also the UN Secretary General Antonio Guterres, the European Union, Britain and Australia were among others to condemn the coup. China declined to criticise anyone, instead calling for all sides to "resolve differences".
Military seized power in a bloodless coup on Monday, detaining democratically elected leader Aung San Suu Kyi. It imposed a one-year state of emergency. The intervention ended a decade of civilian rule in Myanmar, with the military grabbing power by alleging fraud in the November elections that Suu Kyi's NLD party won in a landslide. Suu Kyi and President Win Myint were detained in the capital Naypyidaw, just hours before parliament was meant to reconvene for the first time since the elections.
The military sealed off roads around the capital with armed troops, trucks and armoured personnel carriers. Military helicopters flew across the city. Military then declared, via its own television channel, a one-year state of emergency and announced that former general Myint Swe would be acting president for the next year.
It alleged "huge irregularities" in the November polls that the election commission had failed to address. "As the situation must be resolved according to the law, a state of emergency is declared," the announcement said. The army later pledged to hold fresh elections after the year-long state of emergency. "We will perform real multi-party democracy... with complete balance and fairness," a statement on the army's official Facebook page said.
Myanmar had been emerging from decades of strict military rule and international isolation that began in 1962. Suu Kyi won the Nobel Peace Prize in 1991 for her work promoting democracy and human rights. She had lived under house arrest for years as she tried to push her country toward democracy and then became its de facto leader after her National League for Democracy won elections in 2015.
Myanmar's November polls were only the second democratic elections the country had seen since it emerged from the 49-year grip of military rule in 2011. The NLD won more than 80 percent of the vote increasing its support from 2011. Meanwhile Indian embassy in Yangon has asked all Indian citizens residing in Myanmar to take due precautions and avoid unnecessary travel, in an advisory issued following the military coup and subsequent political developments in the country.