TBILISI, Georgia — Georgia’s breakaway Abkhazia region accused Tbilisi on Thursday of trying to suffocate the Black Sea territory and threatened a “proportionate response” after Georgian authorities detained a tanker delivering fuel.

Georgia has stepped up efforts to isolate Abkhazia and another breakaway region, South Ossetia, since a five-day war with Russia last August. It has banned economic and commercial activities there without its permission.

The Turkish captain of the tanker, operating under a Panama flag, was remanded in custody Wednesday and faces up to 24 years imprisonment if found guilty of smuggling and violating the ban on unauthorized economic activity.

“Under the law in force in Georgia, we don’t even have the right to breathe without permission from Tbilisi,” Abkhazia’s foreign minister, Sergei Shamba, told Interfax.

“We warned Georgia that we can make a proportionate response, take the same kind of actions that the Georgian side allows itself,” he said.

The tanker, with its Turkish and Azeri crew, was detained in the Black Sea off the Georgian coast on Monday carrying 2,000 tons of gasoline and 700 tons of diesel.

No date has been set for the captain’s trial. Abkhazia said it was the third case of “Georgian piracy” this year. The tanker remains in the Georgian port of Poti.