Russian President Vladimir Putin indicated that Moscow would restart the Nord Stream natural-gas pipeline to Europe on Thursday but warned that flows could be curbed soon after if sanctions prevent additional maintenance on its components.

Nord Stream, the main artery for Russian gas to Europe, is currently down due to regular maintenance and European governments are worried the Kremlin won’t restore its flow when the work ends Thursday. A prolonged outage could prompt governments to ration energy, hurting industry and hitting already fragile economic growth.