Lochte, 35, clocked 1min 57.76 to win a 27th national title and stamp himself a contender to make a fifth Olympic team next year.
Lochte, who turns 35 on Saturday, booked his place at the US Olympic trials after clocking 1min 57.88sec in the 200 medley at the US National Championships in Palo Alto.
The 22-year-old Olympic bronze medallist was formally accused of committing an indecent act by compulsion, an official at the Gwangju District Prosecutors' Office told AFP.
Local police are investigating allegations against the Olympic bronze medallist, who was detained and questioned over an incident at a nightclub in Gwangju, some 330 kilometres (200 miles) south of Seoul, a police official told AFP.
The 20-year-old, part of Australia's 4x100m freestyle team that set a world record at last year's Commonwealth Games, failed an out-of-competition test late last month.
FINA did not provide details on the bans athletes would face.
Horton's decision not to stand on the podium after taking silver behind Sun in last weekend's 400m freestyle reignited their war of words.
Phelps described Milak's time of one minute, 50.73 seconds in Gwangju as "incredible", although he admitted his astonishment was tinged with sadness at losing a world record which had stood since 2009.
Scott, who tied for bronze, refused to shake hands with Sun on the podium in Gwangju after the playing of the national anthem or join him and the other medallists on the top step to pose for photos.
The pair eyeballed each other as they closely passed on the pool deck during the morning's 800m freestyle heats, prompting Sun to glare back over his shoulder at Horton before waving to fans as he left the arena.
Peaty previously shared the record of two 100m breaststroke world titles with American Brendan Hansen and Hungary's Norbert Rozsa.
Triple Olympic champion Sun is facing allegations, outlined in a leaked FINA doping panel report, that he smashed vials of blood with a hammer when testers visited him last year.
The controversial triple Olympic gold medallist slapped the water in delight, pointing to his flag-waving Chinese fans as he savoured an emotional victory over Australian Horton and his 10th world championship gold medal.
Sun is one of the biggest names in the sport, the only swimmer to capture Olympic gold over 200, 400 and 1,500 metres, but has been plagued by scandal throughout his career.
Delegates from 167 National Federations attended the General Congress.