Radu Dogaru is among six Romanians on trial for last year's spectacular three-minute heist from the Kunsthal museum in Rotterdam which stunned the art world.
Despite their 18-million-euro estimated value, none of the paintings that belonged to the Triton Foundation was equipped with an alarm, Dutch authorities said.
"I could not imagine that a museum would exhibit such valuable works with so little security", Dogaru told the court today.
"If we do not receive answers about who is guilty" for the failure of the security system at the museum, "we are considering hiring Dutch lawyers to start a legal case in The Netherlands or in Romania."
Also Read
The lawyer explained that, if found guilty of negligence, the Kunsthal "would have to share the burden of compensation" with his client, who faces millions in claims from insurers.
Among the paintings carried away in burlap sacks in the pre-dawn heist on October 16, 2012 were Pablo Picasso's "Tete d'Arlequin", Claude Monet's "Waterloo Bridge" and "Femme Devant une Fenetre Ouverte, dite La Fiancee" by Paul Gauguin.
Olga Dogaru later retracted her statement but experts from Romania's National History Museum said ashes retrieved from her stove included the remains of three oil paintings and nails from frames used before the end of the 19th century.
"The paintings were certainly not destroyed. I don't know where they are but I believe they have been sold", Radu Dogaru told the judge today, in his first public statement on the matter.
Last month, the director of Romania's National History Museum said the nails could not come from icons.
Dogaru's lawyer has in recent months made contradictory statements about the fate of the masterpieces, saying his client could give back five of them, without providing evidence, later alleging that they might be in Moldova.
A separate investigation into the possible destruction of the artwork is pending.