Xi met one-on-one with Iranian counterpart Hassan Rouhani on Sunday following a two-day regional security summit in the eastern Chinese city of Qingdao that also included Russian Federation and former Soviet republics.
"Once again, nothing concrete was said", Putin said, referring to the G7 statement.
"But I believe it's a technical issue", he said.
"We are ready for this", he said. The Skripals were in critical condition for weeks before recovering.
Putin's latest trip has emphasised the positive mood music between the Russian and Chinese presidents which is underpinning the wider warming of ties.
Expelled from the club of rich nations in 2014 after it seized Crimea from Ukraine, Russia has tried to rebrand itself as an Asian power, rather than a European one, abandoning visions once eagerly embraced by Mr. Putin of a common economic space stretching from Lisbon to Vladivostok.
Putin added that although he met with President Trump at various worldwide venues, they never got an opportunity to discuss Russian-U.S. relations.
Trump said on Friday that Russian Federation should have attended a Group of Seven summit in Canada over the weekend, an idea that even Moscow seemed to reject saying it was focused on other formats.
"You know, whether you like it or not, and it may not be politically correct, but we have a world to run and the G7, which used to be the G8, they threw Russia out, they can let Russia come back in, because we should have Russia at the negotiating table", Trump told reporters before leaving Washington.
With the president of aspiring full member Iran looking on, Putin said Moscow still supports the Iran nuclear deal that Trump recently abandoned.
He said that he shares Trump's concern about the escalation of an arms race between the US and Russian Federation.More news: Fox News host calls Trump a 'dictator' in TV gaffe
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"The very fact that we confirm the high level of our interaction and talk about the need for its development, in my opinion, is of great importance, for contemporary worldwide relations, for Russian-Chinese relations", he said.
Nebraska Republican Sen. Ben Sasse said in a statement, "Putin is not our friend and he is not the President's buddy".
In the energy sector, the two states have signed a $400 billion natural gas supply deal for an approximately 3,200km gas pipeline from eastern Siberia to northeast China.
Putin said the bloc's new counterterrorism agreement foresees joint drills, exchanging information and conducting coordinated anti-terror action.
Founded in 2001, the Beijing-based SCO has largely served as a vehicle for resolving border issues, fighting terrorism and - more implicitly - to counter American influence in Central Asia following its invasion of Afghanistan.
"As far as I know, the U.S. president has stated that the United States is considering the possibility of additional regulation of deliveries of the automotive vehicles to the USA market".
President mentioned that Pakistan looks forward to participating in the 17th meeting of Council of Heads of Government of SCO member states which will be held in Dushanbe, Tajikistan in October 2018.
Trump is in Singapore for his historic meeting with North Korean President Kim Jong Un.
Putin also praised joint efforts for peace in the world and affirmed that on the major issues of security, China and Russian Federation stand united.
Rouhani said the U.S. was monitoring the global reaction to its withdrawal from the nuclear deal, and a weak response would encourage it to carry on acting unilaterally.
Speaking during a summit of the Shanghai Cooperation Organization in Qingdao on Sunday, Putin emphasized that the bloc members are anxious about the US move.