U.S., EU, Ukraine and Russia have agreed to talks.
Nadler represents one of the largest Jewish districts in the nation.
He said the U.S. is ready to impose additional penalties if the situation doesn't improve.
People reported fliers that asked Jews to register with the government.
A House Democrat is calling on President Obama to discuss currency manipulation issues during meetings with Japanese leaders next week.
Rep. Mike Michaud (D-Maine) on Thursday called on President Obama to raise the issue of Japanese currency manipulation during his visit to Japan next week.
An official said such a move would hurt the Kremlin's image as a supplier.
The items include medical supplies, water purification units and generators.
A group of House lawmakers is headed to the Asia-Pacific on Friday for a week of talks with top leaders in Japan, South Korea and China to discuss strengthening economic, trade and security ties.
President Obama’s effort to refocus U.S. attention to the Asia-Pacific region is falling short, a new report by the Democrats on the Senate Foreign Relations Committee warns.