Post World War II, Romania fell into the Soviet Union's sphere of influence and joined the Warsaw Pact. However, by the beginning of 1964 Romania began to diverge from Soviet direction and as a result, saw limited military support afterwards, with the rift between the two countries widening in 1968 after the invasion of Czechoslovakia. Three ships were transferred to the Romanian Navy in 1970. The Romanian ships carried the older RBU-2500 ASW rocket launchers and twin torpedo tubes using Soviet Type 53 torpedoes. All three ships were constructed at Zelenodolsk and were transferred upon completion. The former Soviet numbers of the individual ships are not known, but it is known that "MPK-106" and "MPK-125" were among the ships given to Romania.