BERLIN/MOSCOW—Germany may consider halting the Nord Stream 2 pipeline if Russia attacks Ukraine, Chancellor Olaf Scholz signaled on Tuesday, as pressure grew on his government to take a more hawkish stance on the Kremlin. Scholz met NATO Secretary-General Jens Stoltenberg in Berlin to discuss the next steps after talks between Russia and Western states on the Kremlin’s deployment of troops along Ukraine’s border ended without a breakthrough last week. Scholz has previously said Germany is open to sanctions in the event of a Russian attack on Ukraine, with everything on the table—which would include the Nord Stream 2 pipeline from Russia to Germany which is intended to bring more Russian gas to Western Europe. Some observers say he is sending mixed signals by calling the pipeline, which has already been built but not yet approved for operation, a private commercial project that should not be singled out for sanctions. His …