America’s relationships with its core democratic partners are set to rebound dramatically after President-elect Joe Biden takes office. Allies in Europe and Asia relish the prospect of an American president committed to adhere to democratic traditions at home, honor strategic commitments abroad and be a team player.

Solidarity among the world’s democracies is especially important when it comes to standing up to China. But the European Union’s decision recently to sign an investment accord with that country underscores the potential for serious discord. Even though the Biden camp cautioned the EU against moving ahead with the agreement, it nonetheless sealed the deal.

To be sure, China’s headstrong ways motivate the world’s democracies to band together against it. Yet, its growing geopolitical heft and the allure of Chinese trade and investment also tempt many countries, democracies included, to curry favor with its government. Accordingly, Biden should launch early in his presidency a concerted effort to forge a united democratic front on China, guided by the following three principles.