Khan said the ICC investigation priorities were intentional targeting of civilian objects and the transfer of populations from Ukraine, including children.
The United States has said estimates from a variety of sources, including Moscow, indicate that authorities have "interrogated, detained, and forcibly deported" up to 1.6 million Ukrainians to Russia since Moscow's invasion.
The United States, United Kingdom and other members called for nations to ensure Russia is held accountable for atrocities they say Moscow has carried out in Ukraine.
"We must make clear to President Putin that his attack on the Ukrainian people must stop ... that there can be no impunity for those perpetrating atrocities," British Foreign Secretary James Cleverly said, adding that the world needed to reject Moscow's "catalogue of lies."