Vice President M. Venkaiah Naidu pays tributes to the heroes of the Estonian struggle for Independence at the Vabaduse Square in Tallinn, Estonia.

PTI Photo

Vice President M. Venkaiah Naidu at a tete-a-tete with the President of the Republic of Estonia Kersti Kaljulaid, at the Presidential Palace, in Tallinn, Estonia.

PTI Photo

Tens of thousands of choir singers gathered in Tallinn, Estonia. Estonia marked the 150th anniversary of a tradition crucial to the national awakening movement and that inspired the defiant "Singing Revolution" in the late 1980s that helped the nation to break free from nearly fifty years of Soviet occupation. The four-day event held every five years unites the small Baltic nation of 1.3 million people in the celebration of their language and culture.

AP Photo/David Keyton

Pope Francis, reviews the honor guard during the welcome ceremony at the Kadriorg Presidential Palace, Estonia. Pope Francis concludes his four-day tour of the Baltics visiting Estonia.

AP Photo/Andrew Medichini

Atletico Madrid teammates celebrate with the trophy after winning the UEFA Super Cup final soccer match between Real Madrid and Atletico Madrid at the Lillekula stadium in Tallinn, Estonia.

AP Photo/Mindaugas Kulbis

German Chancellor Angela Merkel, second left, speaks with Danish Prime Minister Lars Lokke Rasmussen, left, as she walks to a group photo during an EU Digital Summit in Tallinn, Estonia.

AP Photo/Virginia Mayo

A F35A fighter jet sits on the tarmac at the Amari Airbase in Harjumaa, Estonia. Two U.S. F-35 fighter jets have arrived in NATO member Estonia to take part in NATO drills as the aircraft see their first operational deployment in continental Europe. The planes with stealth technology to avoid detection by radar landed at the Amari air base from the Royal Air Force base in Britain.

AP Photo