If a foreign State ceases to exist under international law and, consequently, a bilateral treaty between the extinct State and the United States lapses, the President cannot use the "receive Ambassadors" clause to bring a new treaty into force between the United States and a successor to the extinct State without Senate advice and consent.

CENTERFORSECURITYPOLICY: Center For Security Policy

According to longstanding principles of international law, when one country has a bilateral treaty with another and is then "succeeded" by a different state (as Russia has succeeded to the rights and duties of the Soviet Union under a number of treaties), the bilateral treaty remains in effect only if both states so affirm--the new state and its predecessor's treaty partner.

CENTERFORSECURITYPOLICY: What ABM Treaty?

EU. That is an idea that horrifies the European Commission, which regards bilateral deals in market matters as little better than jungle law that would undermine Europe's single market.

ECONOMIST: The row over the EU��s market isn��t over

The proposals will force all EU countries to notify the Commission of any agreements they wish to maintain that were concluded before the Lisbon Treaty and will give the Commission the power to review all bilateral agreements to ensure they are in compliance with EU law.

BBC: Laws on EU trade agreements

One answer might be a bilateral agreement between Hungary and Slovakia which echoed the provisions of the law without mentioning it.

ECONOMIST: Hungary

The Initiative has also led to unprecedented bilateral anti-crime information sharing and collaboration, including the placement of vetted Mexican law enforcement professionals within EPIC and the Air and Marine Operations Center.

WHITEHOUSE: Strengthen International Partnerships