Two German warships await orders from Berlin, their commander said, to determine whether next month they will be the first German naval vessels in decades to pass through the Taiwan Strait, drawing a rebuke from Beijing.

While the U.S. and other nations, including Canada, have sent warships through the narrow strait in recent weeks, it would be the German navy’s first passage through the strait since 2002.

China claims sovereignty over democratically governed Taiwan, and says it has jurisdiction over the nearly 180-km (110 miles) wide waterway that divides the two sides and is part of the South China Sea. Taiwan strongly objects to China’s sovereignty claims and says only the island’s people can decide their future.

The Taiwan Strait is a major trade route through which about half of global container ships pass, and both the United States and Taiwan say it’s an international waterway.