Volkswagen’s trucks division is close to announcing a partnership with U.S.-based rival Navistar International, three sources told Reuters, in the latest example of a deal driven by emissions regulations.

Volkswagen vlkay has agreed to supply engines to Navistar nav in exchange for a 19.9% stake in the truckmaker, one of the sources, who declined to be named, told Reuters.

Volkswagen will pay around $16 per Navistar share or about €200 million ($223 million) in total, the source said.

The deal will be announced as soon as Tuesday, the sources said. Volkswagen and Navistar declined to comment.

The financial burden of developing next generation engines to meet new emissions standards is forcing several vehicle makers to pursue partnerships and technology deals.

In May, Nissan nsany took a 34% stake in Mitsubishi Motors mmtof , while in 2013, Aston Martin agreed to sell a 5% stake to Mercedes-Benz parent Daimler ddaif in exchange for delivering next generation engines and electronics that meet the latest emissions rules.

 

Volkswagen’s commercial vehicles division is trying to build itself into a global truck manufacturer having absorbed Germany’s MAN and Sweden’s Scania, while Navistar is looking for a technology partner to build engines that can meet ever more stringent emissions rules.

For Volkswagen, Navistar is seen as an attractive target because it has a large North American dealer network, something the German company lacks.

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Navistar, which has a market value of around $1.15 billion, has been on the lookout for an engine partner since 2010 when it failed to get approval from the U.S. Environmental Protection Agency for its heavy-duty diesel truck engine.

The two companies have been in talks about a potential tie-up for years, but Volkswagen has been distracted for much of the past 12 months by a diesel emissions test cheating scandal that has seen several top management departures.