U.S. and Ukrainian officials on Sunday discussed the possibility of Russian President Vladimir Putin expanding his invasion from the Donbas region of southeastern Ukraine into the neighboring nation of Moldova — another former Soviet state and non-NATO member in Eastern Europe.

“I think where they go from here remains to be seen,” deputy national security adviser Jon Finer told NBC’s “Meet the Press” in an interview, referring to Russian forces. “But they are a long way from cities like Odesa” — the Black Sea port city in southern Ukraine — “and certainly from Moldova.”

Russian forces “have a lot of fighting still to do,” Finer added, “and we think the Ukrainians are going to be very effective in fending them off.”

Pressed on how the Biden administration’s wartime strategy would change if Russia began making moves toward Moldova, Finer responded that the United States has “shown an ability to be nimble” and “to adjust our assistance and our approach as the Russian war aims have evolved.”