Estonian Prime Minister Kaja Kallas, one of the EU’s most outspoken Russia critics, is tipped to step into the most powerful foreign policy role in Brussels in a move that could send a strong signal to Moscow. The bloc’s 27 leaders have pencilled in Kallas’ name for the EU’s top diplomatic job, currently held by Spain’s Josep Borrell, with a final decision expected this week. If her nomination is formalised by EU leaders on Thursday and then approved by the European Parliament’s foreign affairs committee, she will become the first eastern European in the role and the first Estonian to ever cli…