Dozens of secondhand Leopard 1 tanks that once belonged to Belgium have been bought by a major European country for the Ukrainian army fighting Russia, according to the arms trader who sold them.

Freddy Versluys, CEO of the private defence company OIP Land Systems, told the Guardian that he sold 49 tanks to another European government, which he could not name due to a confidentiality clause.

Versluys previously bought 50 Leopard 1 tanks for €37,000 each (about £29,600) that the Belgian government decommissioned in 2014 as part of a wider trend among western countries of cutting defence spending.

The German-made Leopards were at the centre of a public spat earlier this year after Belgian defence minister Ludivine Dedonder said it considered buying the tanks but accused the firm of trying to make a “huge profit” from the sale.

The clash underlined a predicament faced by western governments trying to find weapons for Ukraine after more than a year of intense warfare – arms they discarded as obsolete are now in high demand, and often owned by private companies.

“The fact that they leave our company proves that we asked for a fair market price and someone was more than happy to take them,” Versluys said in a post on LinkedIn on Tuesday, accompanied by a picture of tanks next to a bottle of Ukrainian vodka.

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