Russia sent troops into Ukraine, which led to Germany scrapping its plans for the Nord Stream II line.
During an address on the Ukraine crisis on Tuesday, the German Chancellor said he was going to re-examine the certification of the pipeline.
He said that the situation has fundamentally changed in light of the most recent developments.
It was the first significant economic consequence of the conflict in Ukraine. The US, EU, and UK promised sanctions later on Tuesday.
Volodymyr Zelensky, the president of Ukraine, said Tuesday that Germany should abandon theNord Stream II.
Reports from eastern Ukraine showed Russian tanks moving into the pro-Kremlin areas.
After a meeting of Russia's security council on Monday, Putin recognized the regions as independent and ordered in Russian troops for a "peacekeeping" mission.
Germany will have to rethink how to meet its energy needs without the Nord Stream II line.
The work on the Russian gas production site route was completed in September of 2021. The pipes went via Ukraine.
The 10 billion euro price tag for the project, owned by Russian gas corporation Gazprom, was to transport 55 billion cubic meters of natural gas a year.
The appropriate departments of the economy ministry will make a new assessment of the security of our supply in light of what has changed in the last few days.
The US said in January that it wouldn't open the line if Russia invaded Ukraine.
State Department spokesman Ned Price said at the time that they would work with Germany to prevent it from moving forward.
New energy infrastructure between Russia and Europe would make it harder for the US to oppose aggressive political moves.
The US lifted sanctions on Russian companies working on the project in May 2021.