BUDAPEST, HUNGARY - FEBRUARY 17:  Russian President Vladimir Putin speaks to the media with Hungarian Prime Minister Viktor Orban at Parliament on February 17, 2015 in Budapest, Hungary. Putin is in Budapest on a one-day visit, his first visit to an EU-member country since he attended ceremonies marking the 70th anniversary of the D-Day invasions in France in June, 2014.  (Photo by Sean Gallup/Getty Images)
Who are Putin's allies?
From Syria to China, Putin has steadily built alliances in areas where Western powers have struggled. CNN's Matthew Chance breaks it down.
01:40 - Source: CNN
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BUDAPEST, HUNGARY - FEBRUARY 17:  Russian President Vladimir Putin speaks to the media with Hungarian Prime Minister Viktor Orban at Parliament on February 17, 2015 in Budapest, Hungary. Putin is in Budapest on a one-day visit, his first visit to an EU-member country since he attended ceremonies marking the 70th anniversary of the D-Day invasions in France in June, 2014.  (Photo by Sean Gallup/Getty Images)
Who are Putin's allies?
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CLEVELAND, OH - JULY 17:  Paul Manafort, campaign manager for Republican presidential candidate Donald Trump, is interviewed on the floor of the Republican National Convention at the Quicken Loans Arena  July 17, 2016 in Cleveland, Ohio. The Republican National Convention begins tomorrow.  (Photo by Win McNamee/Getty Images)
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WASHINGTON, DC - FEBRUARY 01:  National Security Adviser Michael Flynn answers questions in the briefing room of the White House February 1, 2017 in Washington, DC. Flynn said the White House is "officially putting Iran on notice" for a recent missile test and support for Houthi rebels in Yemen.  (Photo by Win McNamee/Getty Images)
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Children hold portraits of Russia's President Vladimir Putin as they take part in a rally to mark Defender of the Fatherland Day in the Crimean city of Sevastopol, on February 23, 2016.
The Defender of the Fatherland Day, celebrated in Russia on February 23, honours the nation's army and is a nationwide holiday.  / AFP / Max Vetrov        (Photo credit should read MAX VETROV/AFP/Getty Images)
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