AMSTERDAM — President Barack Obama delved into a day of delicate diplomacy today as he sought to rally the international community around efforts to isolate Russia following its incursion into Ukraine.

Hours after arriving in the Netherlands for a nuclear summit, Obama held one-on-one talks with Chinese President Xi Jinping. China has often sided with Russia in disputes with the West, but U.S. officials have been appealing to Beijing’s well-known opposition to outside interference in other nation’s domestic affairs.

Obama treaded carefully in statements with Xi before their meeting, saying only they planned to discuss the situation in Ukraine.

“I believe ultimately, that by working together, China and the United States can help strengthen international law and respect for the sovereignty of nations and establish the kind of rules internationally that allow all peoples to thrive,” Obama said in a subtle appeal for Chinese support.

He added he and the Chinese leader would also seek to “work through frictions that exist in our relations” on matters like human rights and maritime disputes.

Xi, for his part, pointed to areas of potential cooperation with the U.S. as he settled in for what Obama described as a wide-ranging session.

Obama’s meeting with Xi opened a week of international travel where crisis in Ukraine tops the agenda. After arriving today in the Netherlands on a sunny and brisk morning and meeting with Dutch Prime Minister Mark Rutte, Obama asserted the U.S. and Europe stand together behind Ukraine.

No issue commands more of Obama’s and Europe’s attention than Russia’s annexation of the Crimean Peninsula and the fear Moscow could decide to expand further into Ukraine. But Obama also is attempting to use his weeklong trip to personally reconnect not only with Europe but Asia and the Middle East, all strategically crucial regions with their own tensions and qualms about the U.S.

Obama’s meeting with Xi highlighted another tricky front in U.S. international relations and comes just a day after The New York Times and the German magazine Der Spiegel reported the U.S. National Security Agency had hacked into the servers of Chinese telecommunications giant Huawei.

Meanwhile, China has been wary of Obama’s efforts to increase U.S. influence in the Asia Pacific region. The U.S. has also called for restraint in China’s maritime territorial disputes with Japan and its Southeast Asian neighbors.

China, a frequent Russian ally, abstained a week ago from voting on a United Nations Security Council resolution declaring Crimea’s secession referendum illegal. With Russia vetoing the measure and the 13 other council members voting in favor, China’s abstention served to isolate Moscow internationally.