Pentagon chief Chuck Hagel toured Asia earlier this month ahead of Obama's coming visit, and at an April 10 stop in Ulan Bator signed a "joint vision" statement with his Mongolian counterpart Dashdemberel Bat-Erdene, calling for expanding military cooperation through joint training and assistance. "A strong US-Mongolia defense relationship is important as part of the American rebalance to the Asia-Pacific region," Hagel told a joint press conference. Bat-Erdene ruled out the possibility of hosting US forces, citing a Mongolian law that bars foreign military bases from the country. But the agreement is clearly aimed at extending US military encirclement of China. Days earlier, Hagel had lectured his hosts in Beijing over China's establishment of an air defense zone in the East China Sea. He also made a flat warning about the disputed Senkaku/Diaoyu islands, telling reporters: "We affirmed that since [the Senkaku Islands] are under Japan's administrative control, they fall under Article 5 of our Mutual Security Treaty." (AFP, April 10; Time, April 8)

More ominous headlines from Ukraine that only leave us wondering what to believe. Winning the prize for combining sensationalism with sloppy vagueness is (surprise) the New York Post, which warns: "Jews in east Ukraine forced to register with authorities." There are two serious problems with this headline. First, if you actually read the story, nobody has been "forced" to do anything—yet, at least. The demand was made in threatening leaflets, with no attempt at enforcement. Second, given the confused situation in east Ukraine, it is completely ambiguous who is indicated by the word "authorities." The "official" Urkainian government, or the Russian-backed separatists who claim to be in control? This is a rather critical point, given all the Russian propaganda about how the Kiev government is "fascist" and "anti-Semitic."

NATO on April 1 began a two-day exercise, briging more than 100 US Air Force personnel, along with F-15 fighter jets and a Germany-based Airborne Warning and Control System (AWACS) craft, to former Soviet air bases in Lithuania. Denmark is also sending six F16 fighter jets to the Baltic as part of an expanded NATO air policing mission, with regular patrols to begin May 1. The incidence of Russian jets flying close enough to Baltic airspace this year to prompt NATO jets being scrambled has increased to about once a week, according to Lithuania's defense ministry. NATO jets were scrambled about 40 times in both 2012 and 2013; in 2004, the year the Baltic republics joined NATO, it only happened once.

The US Defense Department is dispatching a naval vessel to the Black Sea to conduct military exercises with allies in the region, as well as deploying additional Marines to enlarge a "rotational crisis response force" in Romania, the Pentagon announced April 3. The Special Purpose Marine Air-Ground Task Force Crisis Response Force, based at Moron Air Base in Spain, is being increased from 500 to 675 and deployed to Romania "to allow greater flexibility." The Pentagon denied that the decision to send the additional Marines to Romania is related to developments in Ukraine. (American Forces Press Service, April 3)

Russian President Vladimir Putin reiterated Moscow's support for Syria's Bashar al-Assad in an April 2 message delivered by a visiting delegation of the Russia-based Imperial Orthodox Palestine Society, headed by the society's chairman Sergei Stepashin. In the message, Putin hailed Assad's war against "international terrorism" that he asserted is "backed" by Western nations. (Xinhua, April 2) The message comes amid reports from Jane's Defense Weekly that Assad's military started using longer-range Russian Smerch and Uragan rockets for the first time in February. Ruslan Pukhov, an adviser to Russia's Defense Ministry and head of the Center of Analysis of Strategies and Technologies, confirmed that Moscow is supplying a "lifeline" of ammunition and parts for tanks, armored vehicles and helicopters to Damascus. Alexei Malashenko, Middle East analyst at the Moscow Carnegie Center, said: "Russia is now doing everything to ensure that Assad wins convincingly. If Russia can show it's capable of carrying out its own foreign policy, regardless of America’s wishes, it will be a major achievement for Putin." (Bloomberg, April 2)

The UN General Assembly approved a resolution on March 27 declaring the Crimean referendum to secede from Ukraine invalid. The resolution calls upon all UN states, international organizations and specialty agencies not to recognize any change in status of the Crimean region despite the referendum. The UN gained broad support for the resolution as 100 states voted in favor, outnumbering the 11 votes against and 58 abstentions. The US Ambassador to the UN Samantha Power stated in regards to the vote that "the draft resolution was about only one issue: affirming a commitment to the sovereignty, political independence, unity and territorial integrity of Ukraine." The Russian Federation representative asked the UN to respect the voluntary choice made by Crimea and not refuse their right to self determination.

The Crimean parliament on March 17 formally declared the region independent and asked to join the Russian Federation following a popular vote to secede from Ukraine. The US and EU have called the vote illegal, and the EU stated that the vote's outcome would not be recognized. The US on March 17 announced sanctions against seven Russian officials while the EU's foreign ministers imposed travel bans and asset freezes against 21 officials from Russia and Ukraine. Though the government in Kiev refuses to recognize the results of the vote, Moscow considers the vote legitimate. The Crimea region, which has been under the control of pro-Russia forces since late February, has appealed to other countries as well as the UN to recognize Crimean independence. As a result of the vote, Crimean officials claim Ukrainian laws no longer apply in the region, and Ukrainian state property there will be nationalized and made part of the property of the Crimean Republic.

Crimean Tatars held protests in the peninsula on March 14 ahead of a referendum to join Russia. Around 500 demonstrators took to the streets calling for "Russian soldiers to return home." Tatar leaders have dismissed this weekend's poll as illegal and called for a boycott. (Euronews) Turkish Prime Minister Recep Tayyip Erdogan has pledged to support Crimea's Tatars. "Turkey has never left Crimean Tatars alone and will never do so," he said, after a phone call to Russian President Vladimir Putin earlier this month. Turkey's Foreign Minister Ahmet Davutoglu vowed to protect the "rights of our kinsmen" after meeting with Ukrainian officials and representatives of the Tatar community during a visit to Kiev. (AFP, March 13) In a move to reassure the Tatars, Crimea's parliament has passed a resolution guaranteeing the ethnic minority proportional representation in the body,  and granting their language official status. (RT, March 11) Meanwhile, street clashes are reported from the eatsern Ukrainian city of Donetsk, with one young man killed in fighting between pro- and anti-Russian demonstrators. (The Guardian, March 14)