Olena Zelenska warns abducted Ukranian kids may take 'dozens of years' to return, praises Melania Trump's help

"The community that has been created by the first lady, Melania Trump, is very important," Zelenska said in a special interview on "The Sunday Briefing."

"I'm very grateful to her for getting involved in this," she added later, her words translated from Ukrainian. "She deeply understands how important this subject is, and I am sure that her involvement is very helpful, because her advocacy attracts attention."

So far, about 2,000 children have been brought back to Ukraine, but she warned the current pace is far too slow.

"If we go as slow as this, it will take dozens of years to bring them all back," Zelenska said.

"It's very important that as many countries as possible join us [in the effort to find them]."

Investigations have found that many of the children have been taken to a network of more than 200 facilities across Russia and occupied territories, where they are subjected to "re-education" programs, placed with Russian families and more.