(Reuters) -Russia has banned entry to several Moldovan officials following Moldova's "unfriendly" decision to expel 22 Russian diplomats, the Russian foreign ministry said on Friday, marking a further worsening of already strained bilateral ties.

Moldova, a former Soviet republic, has been buffeted by Russia's war in neighbouring Ukraine. Moldova's pro-European president, Maia Sandu, has denounced Russia's invasion and accused Moscow of trying to destabilise her own country.

Twenty-two Russian diplomats flew out of the Moldovan capital Chisinau on Aug. 14, leaving behind a skeleton staff.

"... this unfriendly step leads to the further destruction of Russian-Moldovan relations, which are already in a deep crisis due to the actions of the Moldovan side," Russia's foreign ministry said in a statement after summoning Chisinau's ambassador to Moscow to express its disapproval.

The envoy was informed that "as an asymmetric response, entry into the Russian Federation was closed to a number of officials of the Republic of Moldova", the ministry said.

It did not identify the Moldovan officials affected by the ban or say how many they were.

Moldova shares a border with both Ukraine and NATO member Romania.

(Reporting by Felix LightEditing by Gareth Jones)