According to a South Korean defense official and a Polish industry leader speaking to Reuters on Wednesday, Seoul approved export licenses last year for Poland to supply Ukraine with Krab howitzers constructed with South Korean components.

The remarks represent the first proof that South Korea officially consented to providing Ukraine weaponry components for its conflict with Russia, at the very least indirectly.

Officials have previously declined to comment on the Krabs, fueling speculation over whether South Korea had formally agreed or was simply looking the other way.

The Defense Acquisition Program Administration’s (DAPA) technology control bureau reviewed and approved the transfer of the howitzer’s South Korean-made chassis, said Kim Hyoung-cheol, director of the Europe-Asia division of the International Cooperation Bureau.

“We reviewed all the documentation and possible issues inside DAPA… then we made decision to give out export license to Poland,” he told Reuters in an interview at DAPA headquarters on the outskirts of Seoul.

He later stressed that the government’s stance is to not transfer weapons systems to Ukraine.

Jacek Matuszak, representative of Poland’s state Polska Grupa Zbrojeniowa (PGZ), a group of more than 50 armaments enterprises including Krab manufacturer Huta Stalowa Wola, confirmed that it had received approval from South Korea.

“We obtained this consent for Ukraine and we obtained it last year, before signing the contract for sale to Ukraine,” he told Reuters.

South Korea’s defense ministry noted that the Krab includes components from several countries, and that the transfer did not involve a complete South Korean weapons system.

The Krab is a self-propelled howitzer made by combining a South Korean K9 Thunder chassis, British BAE Systems turret, French Nexter Systems 155 mm gun, and a Polish fire control system.

Following Russia’s invasion in February last year, Poland sent 18 Krabs to Ukraine in May, and the two countries have signed orders for dozens more.

Russia calls the war a “special military operation”, and President Vladimir Putin last year accused Seoul of providing Ukraine with weapons, saying such a decision would ruin their bilateral relations.

South Korean President Yoon Suk Yeol said at the time that South Korea, a U.S. ally, had not provided any weapons. His administration says it has no plans to change that policy.

Yoon has said South Korean law makes it difficult to directly sell weapons to countries in active conflict. Seoul has also been reluctant to anger Russia despite growing pressure from the United States and NATO countries to provide weapons and ammunition.

“We obviously think South Korea should be doing more, and we have been communicating that to the Yoon administration regularly,” a Western diplomatic source in Seoul told Reuters.

During a visit to Seoul in January, NATO Secretary-General Jens Stoltenberg urged South Korea to increase military support to Ukraine, citing other countries that have changed their policy of not providing weapons to countries in conflict following Russia’s invasion.

The head of DAPA has the right to decide what to export, but in practice it is up to the president as well, said Yang Uk, research fellow and defense expert at Seoul’s Asan Institute for Policy Studies.

“A government has to consider all positions including the foreign ministry’s position, diplomacy, as well as economic considerations,” he said. “If Korea supports Ukraine, Russia may retaliate by selling up-to-date aircraft to North Korea or transfer technology that North Korea really needs.”

South Korea has benefited from Europe’s rush to rearm, signing a massive $5.8 billion arms deal with Poland last year for hundred of Chunmoo rocket launchers, K2 tanks, K9 self-propelled howitzers, and FA-50 fighter aircraft.

DAPA’s Kim said Poland would need further South Korean permission to provide any of those new weapons to Ukraine. The Administration’s officials previously stressed that those sales are for boosting Poland’s defenses, rather than helping Ukraine.

South Korea’s sensitivity over the issue has been highlighted by a deal to sell 155 mm artillery shells to the United States. Officials in Washington have said they want to send the ammunition to Ukraine, but South Korea insists that the United States must be the end user.

A spokesman for South Korea’s ministry of defense said negotiations for that deal are ongoing.