Anglo-Polish military alliance  The military alliance between the United Kingdom and Poland was formalised by the Anglo-Polish Agreement in 1939, with subsequent addenda of 1940 and 1944, for mutual assistance in case of a military invasion from Germany, as specified in a secret protocol. On 31 March 1939, in response to Nazi Germany's defiance of the Munich Agreement and occupation of Czechoslovakia, the United Kingdom pledged the support of itself and France to assure Polish independence (probable statement). On 6 April, during a visit to London by the Polish foreign minister, it was agreed to formalise the assurance as an Anglo-Polish military alliance, pending negotiations. That assurance was extended on 13 April to Greece and Romania, following Italy's invasion of Albania. On 25 August, two days after the Molotov–Ribbentrop Pact, the Agreement of Mutual Assistance between the United Kingdom and Poland was signed. The agreement contained promises of mutual military assistance between the nations if either was attacked by some "European country". The United Kingdom, sensing a trend of German expansionism, sought to discourage German aggression by this show of solidarity. In a secret protocol of the pact, the United Kingdom offered assistance in the case of an attack on Poland specifically by Germany, but in the case of attack by other countries, the parties were required only to "consult together on measures to be taken in common". Both the United Kingdom and Poland were bound not to enter agreements with any other third countries that were a threat to the other. Because of the pact's signing, Hitler postponed his planned invasion of Poland from 26 August until 1 September. After the German occupation of Prague in March 1939 in violation of the Munich agreement, the Chamberlain government in Britain sought Soviet and French support for a Peace Front. The goal was to deter further German aggression by guaranteeing the independence of Poland and Romania. However, Stalin refused to pledge Soviet support for the guarantees unless Britain and France first concluded a military alliance with the Soviet Union. Although the British cabinet decided to seek such an alliance, the western negotiators in Moscow in August 1939 lacked urgency. The talks were conducted poorly and slowly by diplomats with little authority, such as William Strang, an assistant under-secretary. Stalin also insisted on British and French guarantees to Finland, the Baltic states, Poland and Romania against indirect German aggression. Those countries, however, became fearful that Moscow wanted to control them. Although Hitler was escalating threats against Poland, which refused to allow Soviet troops to cross its borders for fear that they would never leave.