Rubio, new in the role, was invited to attend a meeting of EU foreign ministers but did not attend, even virtually.
His apparent blanking of the invitation caused some officials in Brussels to worry that President Donald Trump’s administration was shirking the EU in favor of building relationships with national figures, as part of a strategy to weaken the bloc.
Kallas said in her post she was looking forward to meeting Rubio soon but did not say a date to meet was set.