But with calls growing for the European Union to hit Russia with fresh sanctions, a number of EU lawmakers have questioned the timing of Borrell's long-planned trip - the first such visit by such a high-ranking EU diplomat since 2017.
Borrell's trip comes before an EU foreign ministers meeting later this month where a joint reaction to developments in Russia is on the agenda.
EU leaders are also due to discuss the matter at a March summit.
A Moscow court sentenced Navalny to three and a half years in a penal camp for a probation violation.
The prominent anti-corruption campaigner failed to check in with authorities while in Germany recovering from a poison attack that has been blamed on Russian domestic intelligence.
The Kremlin has so far brushed off foreign criticism as external interference.
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