Republican and Democratic U.S. senators introduced legislation on Thursday to impose stiff new sanctions on Russia and combat cyber crime, the latest effort by lawmakers to punish Moscow over interference in U.S. elections and its activities in Syria and Ukraine.

The bill includes restrictions on new Russian sovereign debt transactions, energy and oil projects and Russian uranium imports, and new sanctions on Russian political figures and oligarchs.

It also expresses strong support for NATO and would require that two-thirds of the Senate to vote in favor of any effort to leave the alliance.