Russia has expelled a total of seven diplomats from Estonia, Latvia, Lithuania and Slovakia, the Russian Foreign Ministry announced.

The ministry gave the three Slovak and two Lithuanian diplomats, as well as an envoy from Latvia and another from Estonia one week to leave Russia. 

Russia accused the four countries of showing "pseudo-solidarity" with the Czech Republic, which ordered most Russian diplomatic staff in Prague to leave last week after accusing Russian spies of being behind a 2014 blast at an ammunition depot. Russia has dismissed the accusations as absurd.

The Czech government accused Russian secret service agents this month of being behind a deadly explosion at an arms depot in eastern Czech Republic in 2014. 

Slovakia and the Baltic states of Estonia, Latvia and Lithuania followed suit in solidarity. 

Russia's foreign ministry on Tuesday said in a statement that a total of four diplomats from Estonia, Latvia and Lithuania have been declared "persona non grata" and must leave the country within seven days.

It added that the Baltic states "continue to conduct an openly hostile course towards our country, in this case hiding behind pseudosolidarity with the indiscriminate actions of the Czech Republic towards Russia". 

In a separate statement, the ministry also announced the expulsion of three Slovak diplomats, who must leave by May 5, and accused Bratislava of offering "false solidarity" to Prague.

(With input from agencies)