Britain on Tuesday joined a growing group of Western nations hardening their use of national security as a litmus test for Chinese investments, with the government in London unveiling a blueprint to sharply tighten its oversight of foreign takeovers.

The proposal, which follows a pledge by Prime Minister Theresa May to protect sensitive industries, widens the scope of deals that Britain can thwart to protect its competitive edge. The new rules being suggested extend the government’s reach when it comes to foreign takeovers, lowering the threshold to include acquisitions of even small companies, intellectual property, individual assets or company shares.

The move aligns Britain more closely with the United States, Canada, Australia and major European economies, which have been strengthening foreign investment and takeover criteria. In Washington, lawmakers are expected to soon expand the powers of a body that investigates international deals for national security risks.

Britain and other governments in the West have had to tread a fine line when it comes to handling investment from China.