SEOUL (Reuters) – Former U.S. presidential candidate Hillary Clinton said on Wednesday that “cavalier” threats to start war on the Korean peninsula are “dangerous and short-sighted”, urging the United States to get all parties to the negotiating table.

Clinton also called on China to take a “more outfront role” in enforcing sanctions against North Korea aimed at curbing its missile and nuclear development.

“There is no need for us to be bellicose and aggressive (over North Korea),” said Clinton at a forum in the South Korean capital Seoul, stressing the need for greater pressure on North Korea and diplomacy to bring Pyongyang to talks.

Tensions between Pyongyang and Washington have soared following a series of weapons tests by North Korea and a string of increasingly bellicose exchanges between U.S. President Donald Trump and North Korean leader Kim Jong Un.

“Picking fights with Kim Jong Un puts a smile on his face,” Clinton said, but did not mention Trump by name.

Clinton also indirectly referred to Trump’s insults towards North Korea on Twitter, saying “the insults on Twitter have benefited North Korea, I don’t think they’ve benefited the United States”.

The tweets are making future negotiations with North Korea difficult, she said, adding that Washington should “incessantly, persistently work” to get involved parties to dialogue with North Korea.

The war of words has seen Trump call the North Korean leader “little rocket man” on a suicide mission, and vowed to destroy North Korea if it threatens the United States or its allies. North Korea has in turn called Trump “mentally deranged”.

Clinton, a former U.S. secretary of state, said Washington’s allies have increasingly been expressing concerns over the reliability of the United States, advising Washington to avoid becoming sidelined with North Korean threats and be “as forcefully patient” as possible.

Regarding China’s role in reining in North Korea, Clinton said Beijing would be better off in taking a “more outfront role” in trying to “tighten and absolutely enforce sanctions” against North Korea.

Clinton said China’s retaliatory actions against South Korean companies doing business in China following the deployment of a U.S. anti-missile system in South Korea would be unnecessary had Beijing done a better job containing and deterring North Korea.

China has been curbing South Korean businesses there since Seoul decided to deploy the Terminal High Altitude Area Defence (THAAD) system, saying its powerful radar could be used to pierce its territory. South Korea and the United States have repeatedly told China that THAAD aims only to defend against North Korea’s missile threats.

“The Chinese can’t have it both ways. They can’t do less than they could to tighten economic pressures on North Korea and same time discount the real threat South Korea and its citizens face,” she said.