Crown Prince Naruhito and Crown Princess Masako marked their 20th wedding anniversary Sunday just months after the Crown Princess, who has been suffering a stress-induced illness, carried out her first official overseas trip in 11 years.

"In the past 20 years, we have experienced many things as a couple together and supported each other," the Crown Prince said in a statement released on the occasion of the anniversary of his 1993 marriage.

Touching on his 49-year-old wife's health, the Crown Prince, 53, said she is "getting better" and "will expand her activities slowly by taking time to do the things she can and continue to make efforts toward her recovery."