The protesters said: "The South Korea-U.S. summit to come next week should be an avenue where the review of the THAAD deployment should be assured".
A South Korean protestor wearing a mask of US President Donald Trump marches toward the US embassy during a rally against the deployment of the US Terminal High Altitude Area Defense (THAAD) system in Seoul on June 24, 2017.
A bipartisan group of USA senators on Thursday introduced a resolution welcoming South Korean President Moon Jae-in's upcoming visit to Washington while reaffirming the importance of the alliance and calling for further expanding all-round cooperation.
Shortly after his election, South Korea's president announced that he'd learned the United States had sent four additional un-approved launchers to the site.
The THAAD uses hit-to-kill technology in which kinetic energy destroys incoming warhead.
North Korea has tested several new missile systems this year, including a powerful midrange missile that experts say could one day reach targets as far as Hawaii or Alaska.
The issue of South Korea's suspension of the THAAD deployment comes against the backdrop of the death of U.S. college student Otto Warmbier shortly after his release from a 17-month captivity by North Korea.
It's a twist on the typical pattern on the Korean Peninsula, where North Korean state media frequently issue reports about leader Kim Jong Un observing missile tests that it says are needed to combat South Korean and USA hostility. Kang was quoted as saying that the two leaders are pragmatic and will have "chemistry".
"The US trusts the South Korean official stance that the THAAD deployment was an Alliance decision".
South Korea's President Moon Jae-in and Trump are due to meet for the first time in Washington next week, with THAAD expected to dominate the agenda.
"Resumption of dialogue with North Korea may need to be pursued in close cooperation and consultation with the United States, but South Korea does not need to be allowed by the USA to do so", Kwun Hyuk-ki, a Presidency spokesman, told Yonhap News Agency.
Asahi said South Korea avoided giving a clear response. And you want to do that.
Trump has called for the total isolation of North Korea and has also threatened force. "Aren't you giving in to them?" asked the U.S. interviewer.
Starting next week, anyone, including foreign tourists, will be able to drive or walk near South Korea's presidential office Cheong Wa Dae at all hours, the office announced Thursday.